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No-attack boss mechanic

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Rycina

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Hi, If the boss summons 3 monsters (at once) e.g. Hydra, Giant Spider, Poison spider is it possible to set the boss not to hit HP while his summons are there? When the summons die the boss can start taking damage.

At the same time, when the summons are active the boss does not move/attack and does not cast spells

TFS 1.4.2
 
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I'm doing something wrong :D

The boss creates (once per boss's life) mobs immediately after summoning, which attack the player (the boss doesn't attack or move).

I would like to add to this that:

*The boss can't take damage when 3 minions are summoned.

*After killing all 3 minions, the boss starts moving, attacking, using spells (but won't summon minions a second time)

Can you help my? My script:

XML: 
<?xml version="1.0" encoding="UTF-8"?>
<monster name="Boss Test" race="venom" experience="0" speed="500" manacost="0" skull="black" script="bosses/Boss_Test.lua">
    <health now="15000" max="15000"/>
    <look type="1326" corpse="0"/>
    <flags>
        <flag summonable="0"/>
        <flag attackable="1"/>
        <flag hostile="1"/>
        <flag illusionable="0"/>
        <flag convinceable="0"/>
        <flag pushable="0"/>
        <flag canpushitems="1"/>
        <flag canpushcreatures="1"/>
        <flag targetdistance="1"/>
        <flag isboss="1"/>
    </flags>
    <elements>
        <element physicalPercent="25"/>
        <element energyPercent="25"/>
        <element firePercent="25"/>
        <element deathPercent="25"/>
    </elements>
    <attacks>
        <attack name="melee" interval="2000" min="-400" max="-550"/>
        <attack name="earth" interval="200" chance="10" range="7" radius="1" min="-300" max="-400">
            <attribute key="shootEffect" value="poison"/>
        </attack>
        <attack name="earth" interval="2000" chance="18" radius="6" target="0" min="-300" max="-400">
            <attribute key="areaEffect" value="poison"/>
        </attack>
        <spell name="Summon Trio Spell" interval="500" chance="100" count="1"/>
    </attacks>
    <defenses armor="100" defense="120"/>
    <defense name="healing" interval="2000" chance="10" min="900" max="1500">
        <attribute key="areaEffect" value="greenshimmer"/>
    </defense>
    <immunities>
        <immunity poison="1"/>
        <immunity lifedrain="1"/>
        <immunity paralyze="1"/>
        <immunity invisible="1"/>
    </immunities>
    <events>
        <event type="think" name="BossThink" script="bosses/Boss_Test.lua"/>
        <event type="healthchange" name="BossHealthChange" script="bosses/Boss_Test.lua"/>
        <event type="death" name="BossDeath" script="bosses/Boss_Test.lua"/>
    </events>
    <voices interval="500000" chance="100">
        <voice sentence="FOOL! YOU HAVE STEPPED INTO A PLACE YOU ARE NOT READY FOR!"/>
    </voices>
</monster>

I know there should be one, but I've already gotten confused myself :d
creaturescripts>scripts>Boss_lua and monster > scripts >Bosses > boss_lua
LUA: 
bossPhases = bossPhases or {}
summonedMinionsFor = summonedMinionsFor or {}
originalSpeed = originalSpeed or {}
minionOwner = minionOwner or {}

local function findClosestCreature(position, radius)
    local spectators = Game.getSpectators(position, false, false, radius, radius, radius, radius)
    local closest, closestDistance = nil, math.huge
    for _, spectator in ipairs(spectators) do
        if spectator:isPlayer() then
            local d = getDistanceBetween(position, spectator:getPosition())
            if d < closestDistance then
                closestDistance = d
                closest = spectator
            end
        end
    end
    return closest
end

local function summonTrio(boss)
    local bossId = boss:getId()
    bossPhases[bossId] = { phase = 1, trioActive = true, summoned = true }
    summonedMinionsFor[bossId] = {}
    originalSpeed[bossId] = boss:getSpeed()
    boss:changeSpeed(-originalSpeed[bossId])

    local centerPos = boss:getPosition()
    local spawnOffsets = {
        {x = 1,  y = 0,  z = 0},
        {x = -1, y = 0,  z = 0},
        {x = 0,  y = 1,  z = 0},
        {x = 0,  y = -1, z = 0}
    }
    local minionNames = {"Chiruku", "Koros", "Roko"}
    local spawnedCount = 0

    for _, off in ipairs(spawnOffsets) do
        if spawnedCount >= 3 then break end
        local pos = { x = centerPos.x + off.x, y = centerPos.y + off.y, z = centerPos.z }
        local tile = Tile(pos)
        if tile and tile:getCreatureCount() == 0 then
            local minion = Game.createMonster(minionNames[spawnedCount+1], pos)
            if minion then
                spawnedCount = spawnedCount + 1
                table.insert(summonedMinionsFor[bossId], minion:getId())
                minionOwner[minion:getId()] = bossId
                minion:registerEvent("BossMinionDeath")
                addEvent(function(minionId)
                    local mCreature = Creature(minionId)
                    if mCreature and mCreature:isCreature() then
                        local enemy = findClosestCreature(mCreature:getPosition(), 10)
                        if enemy then
                            mCreature:setTarget(enemy)
                        end
                    end
                end, 500, minion:getId())
            end
        end
    end
    boss:say("Chiruku, Koros and Roko have arrived!", TALKTYPE_MONSTER_SAY)
end

function onThink(creature)
    if not creature or not creature:isMonster() then
        return true
    end
    local boss = creature
    local bossId = boss:getId()
    if boss:getName() == "Boss Test" and not bossPhases[bossId] then
        summonTrio(boss)
    end
    if bossPhases[bossId] and bossPhases[bossId].trioActive then
        if boss:getTarget() then
            boss:setTarget(nil)
        end
    end
    return true
end

function onHealthChange(creature, attacker, primaryDamage, primaryType, secondaryDamage, secondaryType)
    local bossId = creature:getId()
    if bossPhases[bossId] and bossPhases[bossId].trioActive then
        return 0
    end
    return primaryDamage
end

function onDeath(creature, corpse, killer, mostDamageKiller)
    local bossId = creature:getId()
    bossPhases[bossId] = nil
    return true
end

LUA: 
summonedMinionsFor = summonedMinionsFor or {}
function onCastSpell(creature, variant)
    local boss = creature
    local bossId = boss:getId()
    if bossPhases and bossPhases[bossId] and bossPhases[bossId].summoned then
        return true
    end
    if not summonedMinionsFor[bossId] then
        summonedMinionsFor[bossId] = { summoned = false, minionIds = {}, originalSpeed = boss:getSpeed() }
    end
    local data = summonedMinionsFor[bossId]
    if not data.summoned then
        data.summoned = true
        addEvent(function()
            local boss = Creature(bossId)
            if not boss then return end
            local currentSpeed = boss:getSpeed()
            boss:changeSpeed(-currentSpeed)
            local pos = boss:getPosition()
            local monsters = {"Chiruku", "Koros", "Roko"}
            for _, name in ipairs(monsters) do
                local minion = Game.createMonster(name, pos)
                if minion then
                    minion:setMaster(boss)
                    table.insert(data.minionIds, minion:getId())
                    minion:registerEvent("TrioMinionDeath")
                    addEvent(function(minionId)
                        local mCreature = Creature(minionId)
                        if mCreature and mCreature:isCreature() then
                            local enemy = findClosestCreature(mCreature:getPosition(), 10)
                            if enemy then
                                mCreature:setTarget(enemy)
                            end
                        end
                    end, 500, minion:getId())
                end
            end
            boss:say("Chiruku, Koros and Roko have arrived!", TALKTYPE_MONSTER_SAY)
        end, 1000)
    end
    return true
end

function onDeath(creature, corpse)
    local bossId = creature:getId()
    local data = summonedMinionsFor[bossId]
    if data then
        creature:changeSpeed(data.originalSpeed)
        for _, id in ipairs(data.minionIds) do
            local m = Creature(id)
            if m then m:remove() end
        end
        summonedMinionsFor[bossId] = nil
    end
    return true
end

LUA: 
function onDeath(creature, corpse, killer, mostDamageKiller)
    local master = creature:getMaster()
    if not master then
        return true
    end
    local bossId = master:getId()
    local data = summonedMinionsFor[bossId]
    if not data then
        return true
    end
    for i, id in ipairs(data.minionIds) do
        if id == creature:getId() then
            table.remove(data.minionIds, i)
            break
        end
    end
    if #data.minionIds == 0 then
        local boss = Creature(bossId)
        if boss then
            boss:changeSpeed(originalSpeed[bossId])
            boss:say("NOOO! MY DEFENSES ARE DOWN!", TALKTYPE_MONSTER_SAY)
        end
        if bossPhases[bossId] then
            bossPhases[bossId].trioActive = false
        end
        summonedMinionsFor[bossId] = nil
        originalSpeed[bossId] = nil
    end
    return true
end


XML: 
    <event type="think" name="BossThink" script="Boss_Test.lua"/>
    <event type="healthchange" name="BossHealthChange" script="Boss_Test.lua"/>
    <event type="death" name="TrioMinionDeath" script="trio_minion_death.lua"/>
 
Last edited:
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This system is straightforward to implement and offers a highly efficient solution by relying solely on EventCallbacks, specifically onSpawn, onDeath, and onHealthChange.

When the boss summons three creatures simultaneously, it becomes completely immobilized — unable to move, cast spells, or receive damage. The boss remains in this stunned state until all summoned creatures are defeated. Once this condition is met, the script is triggered: the stun is lifted, and the boss regains full functionality, including movement, spellcasting, and the ability to engage players.

This method eliminates the need for onThink and getSpectators, which are known to be more resource-intensive. Additionally, a lightweight tracking system based on the boss’s unique ID has been implemented, further improving performance and reliability. You can refer to the attached GIF to see the system in action.

system.gif
Note: If your TFS source does not yet support the stun function, you will need to implement it. This function is responsible for fully freezing the boss — disabling movement, spells, and attacks.
Leo32

Spell Thread '[TFS 1.X] Shield Bash'

This is a spell knights can use to stun.
It's basically a Leona Q, it's damage is similar to a brutal strike, with the damage scaling off of the player's SKILL_SHIELD.
Because of the power of a stun, its duration does not increase - I have it at 3 seconds by default which halves to 1.5 on players.

vwS0Nj2.gif


spells.xml
XML: 
<instant group="attack" name="Shield Bash" words="shield bash" lvl="15" mana="80" prem="1" aggressive="1" needtarget="1" range="1" exhaustion="10000" groupcooldown="2000" script="custom/shield bash.lua">
    <vocation name="..." />...
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That part isn't necessary, you can remove it — I've already configured the script for that
Rycina said:
<events> <event type="think" name="BossThink" script="bosses/Boss_Test.lua"/> <event type="healthchange" name="BossHealthChange" script="bosses/Boss_Test.lua"/> <event type="death" name="BossDeath" script="bosses/Boss_Test.lua"/> </events>
Click to expand...


Just add this to your data/scripts/filename.lua — this is revscripts. Be happy! :)

LUA: 
local config = {
    bossName = "Boss Test",
    minionNames = {"Chiruku", "Koros", "Roko"},
    spawnMessage = "Chiruku, Koros and Roko have arrived to protect me!",
    defenseDownMessage = "NOOO! MY DEFENSES ARE DOWN!",
    minionCount = 3
}

local activeBosses = {}

local function applyStun(creature)
    local stunCondition = Condition(CONDITION_STUN)
    stunCondition:setParameter(CONDITION_PARAM_TICKS, -1)
    creature:addCondition(stunCondition)
end

local function removeStun(bossId)
    local creature = Creature(bossId)
    if creature then
        creature:removeCondition(CONDITION_STUN)
        creature:say(config.defenseDownMessage, TALKTYPE_MONSTER_SAY)
    end
end

local bossSpawn = EventCallback
bossSpawn.onSpawn = function(creature, position, startup, artificial)
    if creature:getName():lower() ~= config.bossName:lower() then
        return true
    end
   
    local bossId = creature:getId()
   
    for i = 1, config.minionCount do
        local minionName = config.minionNames[i]
        local minion = Game.createMonster(minionName, position)
        if minion then
            minion:setMaster(creature)
            minion:registerEvent("DeathTracker")
        end
    end
   
    activeBosses[bossId] = true
   
    applyStun(creature)
    creature:say(config.spawnMessage, TALKTYPE_MONSTER_SAY)
   
    creature:registerEvent("BossHealthSummonTracker")
   
    return true
end
bossSpawn:register()

local bossHealthSummonTracker = CreatureEvent("BossHealthSummonTracker")
function bossHealthSummonTracker.onHealthChange(creature, attacker, primaryDamage, primaryType, secondaryDamage, secondaryType, origin)
    local summons = creature:getSummons()
    local summonCount = summons and #summons or 0
   
    if summonCount > 0 then
        if not creature:hasCondition(CONDITION_STUN) then
            applyStun(creature)
        end
        return 0, primaryType, 0, secondaryType
    end
   
    return primaryDamage, primaryType, secondaryDamage, secondaryType
end
bossHealthSummonTracker:register()

local deathTracker = CreatureEvent("DeathTracker")
function deathTracker.onDeath(creature, corpse, killer, mostDamageKiller, lastHitUnjustified, mostDamageUnjustified)
    local master = creature:getMaster()
   
    if master and master:getName():lower() == config.bossName:lower() then
        local bossId = master:getId()
        local summons = master:getSummons()
        local summonCount = summons and #summons - 1 or 0
       
        if summonCount == 0 then
            removeStun(bossId)
        end
    elseif creature:getName():lower() == config.bossName:lower() then
        local bossId = creature:getId()
       
        activeBosses[bossId] = nil
    end
   
    return true
end
deathTracker:register()
 
Last edited:
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in game.cpp I have it differently. How to replace it so that it doesn't cause an error?

LUA: 
    uint32_t muteTime = player->isMuted();
    if (muteTime > 0) {
        player->sendTextMessage(MESSAGE_STATUS_SMALL, fmt::format("You are still muted for {:d} seconds.", muteTime));
        return;
    }


Code: 
replace:
C++:
ss << "You are still muted for " << muteTime << " seconds.";

with: (We apply CONDITION_MUTE in the script to make use of this timer AND to stop players from casting instant spells)
C++:


ss << "You are still ";
if (player->hasCondition(CONDITION_STUN)) {
    ss << "stunned";
} else {
    ss << "muted";
}
ss << " for " << muteTime << " seconds.";
 
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Rycina said:
uint32_t muteTime = player->isMuted(); if (muteTime > 0) { player->sendTextMessage(MESSAGE_STATUS_SMALL, fmt::format("You are still muted for {:d} seconds.", muteTime)); return; }
Click to expand...
You can modify this part right here and then compile.
C++: 
uint32_t muteTime = player->isMuted();
if (muteTime > 0) {
    std::ostringstream ss;
    ss << "You are still ";
    if (player->hasCondition(CONDITION_STUN)) {
        ss << "stunned";
    }
    else {
        ss << "muted";
    }
    ss << " for " << muteTime << " seconds.";
    player->sendTextMessage(MESSAGE_STATUS_SMALL, ss.str());
    return;
}
 
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Mateus Robeerto said:
You can modify this part right here and then compile.
C++: 
uint32_t muteTime = player->isMuted();
if (muteTime > 0) {
    std::ostringstream ss;
    ss << "You are still ";
    if (player->hasCondition(CONDITION_STUN)) {
        ss << "stunned";
    }
    else {
        ss << "muted";
    }
    ss << " for " << muteTime << " seconds.";
    player->sendTextMessage(MESSAGE_STATUS_SMALL, ss.str());
    return;
}
Click to expand...
Work.

boss script boss.lua locations should I also remove that?

And spell summon_trio.lua should I leave or does revscript also summon?
 
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Rycina said:
boss script boss.lua locations should I also remove that?

And spell summon_trio.lua should I leave or
Click to expand...
Yes, you should remove it — RevScript already handles summoning for this.

If you want, I can make another version: when the boss spawns, it doesn’t summon anything yet. But as soon as a player enters a specific arena area, the boss reacts and immediately summons three creatures at once. While the summons fight the player, the boss stays inactive, as if it's relying on them to defend it. Once all the summons are defeated, the boss says: 'NOOO! MY DEFENSES ARE DOWN!' and then starts attacking the player or players.

Do you also want the boss to be able to summon more creatures after a certain time if the previous ones die? If so, I can create a different version of the script for that.
 
Upvote 0 Downvote
Mateus Robeerto said:
Yes, you should remove it — RevScript already handles summoning for this.

If you want, I can make another version: when the boss spawns, it doesn’t summon anything yet. But as soon as a player enters a specific arena area, the boss reacts and immediately summons three creatures at once. While the summons fight the player, the boss stays inactive, as if it's relying on them to defend it. Once all the summons are defeated, the boss says: 'NOOO! MY DEFENSES ARE DOWN!' and then starts attacking the player or players.

Do you also want the boss to be able to summon more creatures after a certain time if the previous ones die? If so, I can create a different version of the script for that.
Click to expand...
I must be doing something wrong. I implemented the solution from "shield bash" that you sent - it worked without errors.
The boss appears, cmd doesn't throw any errors but the boss doesn't summon monsters (and can be beaten right away) and the stopping mechanic doesn't work

Guardian.xml:
LUA: 
<?xml version="1.0" encoding="UTF-8"?>
<monster name="Guardian" race="venom" experience="0" speed="500" manacost="0" skull="black">
    <health now="30000" max="30000"/>
    <look type="1326" corpse="0"/>
    <flags>
        <flag summonable="0"/>
        <flag attackable="1"/>
        <flag hostile="1"/>
        <flag illusionable="0"/>
        <flag convinceable="0"/>
        <flag pushable="0"/>
        <flag canpushitems="1"/>
        <flag canpushcreatures="1"/>
        <flag targetdistance="1"/>
        <flag isboss="1"/>
    </flags>
    <elements>
        <element physicalPercent="25"/>
        <element energyPercent="25"/>
        <element firePercent="25"/>
        <element deathPercent="25"/>
    </elements>
    <attacks>
        <attack name="melee" interval="2000" min="-400" max="-550"/>
        <attack name="earth" interval="200" chance="10" range="7" radius="1" min="-300" max="-400">
            <attribute key="shootEffect" value="poison"/>
        </attack>
        <attack name="earth" interval="2000" chance="18" radius="6" target="0" min="-300" max="-400">
            <attribute key="areaEffect" value="poison"/>
        </attack>
    </attacks>
    <defenses armor="100" defense="120"/>
    <defense name="healing" interval="2000" chance="10" min="900" max="1500">
        <attribute key="areaEffect" value="greenshimmer"/>
    </defense>
    <immunities>
        <immunity poison="1"/>
        <immunity lifedrain="1"/>
        <immunity paralyze="1"/>
        <immunity invisible="1"/>
    </immunities>
    <voices interval="500000" chance="100">
        <voice sentence="FOOL! YOU HAVE STEPPED INTO A PLACE YOU ARE NOT READY FOR!"/>
    </voices>
</monster>


data>scripts>bosses>Guardian_mechanic.lua:

Code: 
local config = {
    bossName = "Guardian",
    minionNames = {"Chiruku", "Koros", "Roko"},
    spawnMessage = "Chiruku, Koros and Roko have arrived to protect me!",
    defenseDownMessage = "NOOO! MY DEFENSES ARE DOWN!",
    minionCount = 3
}

local activeBosses = {}

local function applyStun(creature)
    local stunCondition = Condition(CONDITION_STUN)
    stunCondition:setParameter(CONDITION_PARAM_TICKS, -1)
    creature:addCondition(stunCondition)
end

local function removeStun(bossId)
    local creature = Creature(bossId)
    if creature then
        creature:removeCondition(CONDITION_STUN)
        creature:say(config.defenseDownMessage, TALKTYPE_MONSTER_SAY)
    end
end

local bossSpawn = EventCallback
bossSpawn.onSpawn = function(creature, position, startup, artificial)
    if creature:getName():lower() ~= config.bossName:lower() then
        return true
    end
 
    local bossId = creature:getId()
 
    for i = 1, config.minionCount do
        local minionName = config.minionNames[i]
        local minion = Game.createMonster(minionName, position)
        if minion then
            minion:setMaster(creature)
            minion:registerEvent("DeathTracker")
        end
    end
 
    activeBosses[bossId] = true
 
    applyStun(creature)
    creature:say(config.spawnMessage, TALKTYPE_MONSTER_SAY)
 
    creature:registerEvent("BossHealthSummonTracker")
 
    return true
end
bossSpawn:register()

local bossHealthSummonTracker = CreatureEvent("BossHealthSummonTracker")
function bossHealthSummonTracker.onHealthChange(creature, attacker, primaryDamage, primaryType, secondaryDamage, secondaryType, origin)
    local summons = creature:getSummons()
    local summonCount = summons and #summons or 0
 
    if summonCount > 0 then
        if not creature:hasCondition(CONDITION_STUN) then
            applyStun(creature)
        end
        return 0, primaryType, 0, secondaryType
    end
 
    return primaryDamage, primaryType, secondaryDamage, secondaryType
end
bossHealthSummonTracker:register()

local deathTracker = CreatureEvent("DeathTracker")
function deathTracker.onDeath(creature, corpse, killer, mostDamageKiller, lastHitUnjustified, mostDamageUnjustified)
    local master = creature:getMaster()
 
    if master and master:getName():lower() == config.bossName:lower() then
        local bossId = master:getId()
        local summons = master:getSummons()
        local summonCount = summons and #summons - 1 or 0
     
        if summonCount == 0 then
            removeStun(bossId)
        end
    elseif creature:getName():lower() == config.bossName:lower() then
        local bossId = creature:getId()
     
        activeBosses[bossId] = nil
    end
 
    return true
end
deathTracker:register()
Post automatically merged:

Thank you for the idea
with possible changes :)
My boss is based on the principle that after killing a certain number of monsters in the room, the script summons him so he immediately sees the players :D
Post automatically merged:

BTW. "Shield Bash" works on my serwer
 
Last edited:
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