Dynamically Getting Creature ID in Eluna

[Bazzlaze]

Hello everyone!
I plan to implement a feature where a character gains experience when they deal damage to a creature (similar to Cabal Online), but I've encountered a problem where Eluna lacks the ability to get the creature's ID. Specifically, the RegisterCreatureEvent (9 = CREATURE_EVENT_ON_DAMAGE_TAKEN) requires specifying a specific NPC ID in advance. My question is: is it possible to get this information dynamically?
I tried writing the following code.

local attackedNPCs = 0

local function getXP(event, creature, player, damage)
    local experienceReward = math.random(damage / 2, damage)
    player:SendBroadcastMessage(damage)
    player:GiveXP(damage)
end

local function OnCreatureTakeDamage(event, player, enemy, damage)
    attackedNPCs = enemy:GetEntry()
    player:SendBroadcastMessage("You have attacked " .. enemy:GetName() .. ".")
    player:SendBroadcastMessage(attackedNPCs)
end

RegisterCreatureEvent(attackedNPCs, 9, getXP)
RegisterPlayerEvent(33, OnCreatureTakeDamage)

CLIENT: 3.3.5
CORE: TRINITY 355 Repack

[stoneharry]

Not the best use case for Lua, but something like this might work:

local function OnCreatureTakeDamage(event, creature, player, damage)
    local experienceReward = math.random(damage / 2, damage)
    player:GiveXP(experienceReward)
end

local function OnPlayerEnterCombat(event, player, enemy, damage)
    if not enemy or not player then
        return
    end
    if not enemy:GetData("event") then
        local id = RegisterUniqueCreatureEvent(enemy:GetGUID(), enemy:GetInstanceId(), 9, OnCreatureTakeDamage) 
        enemy:SetData("event", id)
    end
end

RegisterPlayerEvent(33, OnPlayerEnterCombat)