TFS 0.X prey system 0.4

[sucibob]

how to create a prey system, using the monster of the day 0.4 from @buchaLL

<event type="death" name="monsteroftheday_onkill" event="script" value="monsteroftheday_onkill.lua"/>

monsteroftheday_onkill.lua

local BOOSTED_MONSTER = 56405
local boostedMonstersList = {"rat", "spider", "troll", "orc", "minotaur", "dwarf", "elf", "skeleton", "amazon", "valkirie", "dark apprentice", "ghoul", "cyclops", "dwarf guard", "necromancer", "vampire", "werewolf", "dragon", "dragon lord", "wyrm", "giant spider", "hydra", "warlock", "demon"}
local bonus = 0.5

function onDeath(cid, corpse, deathList)

local master = getCreatureMaster(cid)
  if (master and master ~= cid) then
    return true
  end

  local boostedMonster = boostedMonstersList[getGlobalStorageValue(BOOSTED_MONSTER)]
    if getCreatureName(cid):lower() == boostedMonster then
    
for i = 1, #deathList do
    
-- loot bonus
    local lootList = getMonsterLootList(getCreatureName(cid))
    for i, _ in pairs(lootList) do
        if lootList[i].count > 1 then
            local numb = math.random(1, lootList[i].count)
            doAddContainerItem(corpse.uid, lootList[i].id, numb)
        elseif math.random(1,100000) <= lootList[i].chance then
            doAddContainerItem(corpse.uid, lootList[i].id, 1)
        end
    end
    
end
    
    end
    return true
end

<script>
        <event name="monsteroftheday_onkill"/>
</script>

1) a action that player can use each 24 hours to change the monster have to kill

2) so after this, the player have 1000 monster with this bonus to kill

3) how this loot bonus works?
how can i change the % loot rates?