Npc giving attribute permanently

[Calder]

TFS 1.3.10
Hello, Is it possible to give an attribute permanently with an npc and how can I do it?

invented storage = 600005

Npc.lua

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)

function onCreatureAppear(cid)               npcHandler:onCreatureAppear(cid)                    end
function onCreatureDisappear(cid)           npcHandler:onCreatureDisappear(cid)                end
function onCreatureSay(cid, type, msg)       npcHandler:onCreatureSay(cid, type, msg)            end
function onThink()                           npcHandler:onThink()                                end


local function creatureSayCallback(cid, type, msg)
    if not npcHandler:isFocused(cid) then
        return false
    end
    local player = Player(cid)
   
    if msgcontains(msg, "power") then
        if player:getStorageValue(600005) < 1 then
           
            add???
            player:setStorageValue(600005, 2)  
           
        elseif     player:getStorageValue(600005) > 1 then  
            npcHandler:say("I already gave you the power", cid)
            npcHandler.topic[cid] = 0
        end
    end
end


npcHandler:setMessage(MESSAGE_GREET, 'Hello |PLAYERNAME|, do you want the {power}?')
npcHandler:setMessage(MESSAGE_FAREWELL, 'Bye.')
npcHandler:setMessage(MESSAGE_WALKAWAY, 'Noob!')

npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())

If I wanted to give: critical chance, crit dmg, mana leech, mana chance leech, life leech, life leech change

This could help I think:
CONDITION_PARAM_SKILL_CRITICAL_HIT_CHANCE
CONDITION_PARAM_SKILL_CRITICAL_HIT_DAMAGE
CONDITION_PARAM_SKILL_LIFE_LEECH_CHANCE
CONDITION_PARAM_SKILL_LIFE_LEECH_AMOUNT
CONDITION_PARAM_SKILL_MANA_LEECH_CHANCE
CONDITION_PARAM_SKILL_MANA_LEECH_AMOUNT

 

[Evil Puncker]

you can use this as base OnAdvance give permanent bonus is possible? (https://otland.net/threads/onadvance-give-permanent-bonus-is-possible.267938/)