Eai galera, pra ajudar o evento que o xtibia esta promovendo de scripting o OMS vou posta um sistema simples pra concorrer.

O Zombie Hunter, é um npc de Task que lhe permite trocar pontos que você acumula matando Monstros por dinheiro e exp mas os pontos só podem ser trocados depois de você ter terminado duas Tasks que o npc vai lhe dar.

o sistema pode ser facilmente modificado pra vários tipos de monstros a edição fica por conta de vocês .

para instalção do creature scripts é só adicionar essa linha no creaturescripts.xml,e jogar o script pra dentro da pasta scripts.

<event type="kill" name="Hunter" event="script" value="task.lua"/>

e registrar o evento Hunter no onLogin.lua

Creaturescripts:

local zombies = { -- task --

      ["Zombie [1]"] = {storagetask = 3290, storagecount = 4290, count = 10, points = 80},

      ["Zombie [2]"] = {storagetask = 3289,  storagecount = 4291, count = 20, points = 130},

      ["Zombie [3]"] = {storagetask = 3288,  storagecount = 4292, count = 30, points = 200},

      ["Zombie [4]"] = {storagetask = 3287,  storagecount = 4293, count = 40, points = 250},

	  --No-task--

	  ["Rat"] = {storagetask = nil,  storagecount = nil, count = nil, points = 15} ,

	  ["Wolf"] = {storagetask = nil,  storagecount = nil, count = nil, points = 35}, 

}


function onKill(cid, target, lastHit)

      local name = getCreatureName(target)

      if zombies[name] then

          if zombies[name].storagetask ~= nil and getPlayerStorageValue(cid, zombies[name].storagetask) > 5 then

              if getPlayerStorageValue(cid, zombies[name].storagetask) < 20 and getPlayerStorageValue(cid, zombies[name].storagecount) <= zombies[name].count - 1 then

                  if getPlayerStorageValue(cid, zombies[name].storagecount) < 0 then 

                      setPlayerStorageValue(cid, zombies[name].storagecount, getPlayerStorageValue(cid, zombies[name].storagecount) + 2)

                      doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_BLUE, "You Killed ["..getPlayerStorageValue(cid, zombies[name].storagecount).."/20] Zombies [2].")

                  else

                      setPlayerStorageValue(cid, zombies[name].storagecount, getPlayerStorageValue(cid, zombies[name].storagecount) + 1)

                      doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_BLUE, "You Killed ["..getPlayerStorageValue(cid, zombies[name].storagecount).."/20] Zombies [2].") 

                  end

              end

          end

		if getPlayerStorageValue(cid, 4593) < 0 then 

            setPlayerStorageValue(cid, 4593, getPlayerStorageValue(cid, 4593) + zombies[name].points + 1)

        else

            setPlayerStorageValue(cid, 4593, getPlayerStorageValue(cid, 4593) + zombies[name].points)

        end

        doSendAnimatedText(getCreaturePosition(target), "+"..zombies[name].points.." points", math.random(255))

      end     

    return true

end

agora você precisa adicionar o npc ao servidor para isso crie um .xml na pasta npc e nele cole isso:

<?xml version="1.0" encoding="UTF-8"?>

<npc name="Paul" script="task.lua" walkinterval="5000" floorchange="0">

	<health now="100" max="100"/>

	<look type="76" head="0" body="0" legs="0" feet="0" addons="0"/>

<parameters>

        <parameter key="message_greet" value="Hello |PLAYERNAME|, I was looking for some {work} to you, or you can change your {points}.

" />

</parameters>

</npc>

e na pasta npc/scripts crie um arquivo lua e dentro dele cole isso:

dofile("config.lua")

local keywordHandler = KeywordHandler:new()

local npcHandler = NpcHandler:new(keywordHandler)

NpcSystem.parseParameters(npcHandler)

local talkState = {}

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                                

function getPlayerID(cid) -- function by Ramza(Ricardo Ianelli)

    local Query = db.getResult("SELECT `id` FROM `players` WHERE `players`.`name` = '"..getCreatureName(cid).."';")

    local player_id = Query:getDataInt("id")

    return player_id

end

function creatureSayCallback(cid, type, msg)

    local playerid = getPlayerID(cid) 

    if(not npcHandler:isFocused(cid)) then

        return false

    end

    if msg == 'work' then

        selfSay('Nowadays, the world is a mess, then I Need your help to "kill" a part of the mess. {Ok}, ', cid)

        talkstatus = 2

    elseif msg == 'points' then

        selfSay(' Do you wanna exchange your points, or {check}/{exchange} them?', cid)

        talkstatus = 41

    elseif msg == 'points' and getPlayerStorageValue(cid, 3290) < 20 and getPlayerStorageValue(cid, 3289) < 20 then 

        selfSay('You have to complete all the tasks', cid)

        talkstatus = 0

    elseif talkstatus == 41 and msg == "exchange"  then

        if getPlayerStorageValue(cid, 3290) >= 20 and getPlayerStorageValue(cid, 3289) >= 20 then

            talkstatus = 29

            selfSay('How much points do you wanna exchange?',cid)

        else

            selfSay('You have to complete 2 tasks to exchange points..',cid)

            talkstatus = 0

        end

    elseif talkstatus == 41 and msg == "check" then

       if getPlayerStorageValue(cid, 4593) < 0 then 

          selfSay('You have '..getPlayerStorageValue(cid, 4593) + 1 ..' points.',cid)

       elseif getPlayerStorageValue(cid, 4593) >= 0 then

          selfSay('You have '..getPlayerStorageValue(cid, 4593)..' points.',cid)

       end

       talkstate = 0

    elseif talkstatus == 29 then

        if isNumber(msg) then

            if getPlayerStorageValue(cid, 4593) >= tonumber(msg) then 

                dinheiro = math.floor(tonumber(msg)*2)

                exp = math.floor(tonumber(msg)*3)

                menos = msg 

                selfSay('It will give you of Money: '..dinheiro.." and of Experience: "..exp..". Are you right?", cid)

                talkstatus = 30

            end

        else

            selfSay('It is an invalid number.',cid) 

        end

    elseif talkstatus == 30 then    

        if msg == 'yes' then

            talkstatus = 29

            doPlayerAddMoney(cid, dinheiro)

            doPlayerAddExp(cid, exp)

            setPlayerStorageValue(cid, 4593, getPlayerStorageValue(cid, 4593)-menos)

            doSendMagicEffect(getCreaturePosition(cid), 98)

            selfSay('thanks',cid)

            talkstatus = 0 

        elseif msg == 'no' then

            talkstatus = 0 

        end      

    elseif talkstatus == 2 then    

        if msg == 'ok' then

            talkstatus = 3

            selfSay('Nice! You have four options for work, {Easy}; {Medium}; {Hard}; {Expert}.',cid)

        elseif msg == 'no' then

            talkstatus = 0 

        end

    elseif talkstatus == 3 and msg == "easy" then

        if getPlayerStorageValue(cid, 3290) < 5 and getPlayerStorageValue(cid, 3290) < 20 then 

            talkstatus = 4

            selfSay('Alright! In Easy Mode, you have to kill 10 Zombies Lv 1 or higher, do you Agree?', cid)

        elseif getPlayerStorageValue(cid, 3290) > 5 and getPlayerStorageValue(cid, 3290) < 20 then

            talkstatus = 14

            selfSay('Did you finish the work?', cid)

        elseif getPlayerStorageValue(cid, 3290) >= 20 then

            selfSay('You have, finished the easy mode', cid)

            talkstate = 0

        end

    elseif talkstatus == 4 then

        if msg == 'yes' then

            setPlayerStorageValue(cid, 3290, 10)

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstate = 0

        elseif msg == 'no' then

            talkstatus = 2

        end 

    elseif talkstatus == 3 and msg == "medium" then

        if getPlayerStorageValue(cid, 3289) < 5 and getPlayerStorageValue(cid, 3289) < 20 then 

           talkstatus = 5

           selfSay('Alright! In Medium Mode, you have to kill 20 Zombies, Lv 2 or higher, do you Agree?', cid)

        elseif getPlayerStorageValue(cid, 3289) > 5 and getPlayerStorageValue(cid, 3289) < 20 then

            talkstatus = 15

            selfSay('Did you finish the work?', cid)

        elseif getPlayerStorageValue(cid, 3289) >= 20 then

            selfSay('You have, finished the medium mode', cid)

            talkstate = 0

        end 

    elseif talkstatus == 5 then

        if msg == 'yes' then

            setPlayerStorageValue(cid, 3289, 10)

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            talkstatus = 2

        end

    elseif talkstatus == 3 and msg == "hard" then

        if getPlayerStorageValue(cid, 3288) < 5 and getPlayerStorageValue(cid, 3288) < 20 then 

           talkstatus = 6

           selfSay('Alright! In Hard Mode, you have to kill 30 Zombies, Lv 3 or higher, do you Agree?', cid)

        elseif getPlayerStorageValue(cid, 3288) > 5 and getPlayerStorageValue(cid, 3288) < 20 then 

           talkstatus = 16

           selfSay('Did you finish the work?', cid)

        elseif getPlayerStorageValue(cid, 3288) >= 20 then

           selfSay('You have, finished the hard mode', cid)

           talkstate = 0

        end 

    elseif talkstatus == 6 then

        if msg == 'yes' then

            setPlayerStorageValue(cid, 3288, 10)

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            talkstatus = 2

        end

    elseif talkstatus == 3 and msg == "expert" then

           if getPlayerStorageValue(cid, 3287) < 5 and getPlayerStorageValue(cid, 3287) < 20 then

               talkstatus = 7

               selfSay('Alright! In Expert Mode, you have to kill 40 Zombies, lv 4 or higher, do you Agree?', cid)

           elseif getPlayerStorageValue(cid, 3287) > 5 and getPlayerStorageValue(cid, 3287) < 20 then

              talkstatus = 17

              selfSay('Did you finish the work?', cid)

           elseif getPlayerStorageValue(cid, 3288) >= 20 then

               selfSay('You have, finished the expert mode', cid)

               talkstate = 0

           end 

    elseif talkstatus == 7 then

        if msg == 'yes' then

            setPlayerStorageValue(cid, 3287, 10)

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            talkstatus = 2

        end

    elseif talkstatus == 14 then

        if msg == 'yes' and getPlayerStorageValue(cid, 4290) >= 10 and getPlayerStorageValue(cid, 3290) < 20 then

            setPlayerStorageValue(cid, 3290, 20)

            doPlayerAddMoney(cid, 10*100)

            doPlayerAddExp(cid, 500)

            selfSay('Nice Work! Thanks for the help, take this reward for helping us. (Experience and Money)', cid)

        elseif msg == "yes" and getPlayerStorageValue(cid, 4290) < 10 then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        end 

    elseif talkstatus == 15 then

        if msg == 'yes' and getPlayerStorageValue(cid, 4291) >= 20 and getPlayerStorageValue(cid, 3289) < 20 then

            setPlayerStorageValue(cid, 3289, 20)

            doPlayerAddMoney(cid, 20*100)

            doPlayerAddExp(cid, 1000)

            selfSay('Nice Work! Thanks for the help, take this reward for helping us. (Experience and Money)', cid)

        elseif msg == "yes" and getPlayerStorageValue(cid, 4289) < 20 then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        end   

    elseif talkstatus == 16 then

        if msg == 'yes' and getPlayerStorageValue(cid, 4292) >= 30 and getPlayerStorageValue(cid, 3288) < 20 then

            setPlayerStorageValue(cid, 3288, 20)

            doPlayerAddMoney(cid, 30*100)

            doPlayerAddExp(cid, 1800)

            selfSay('Nice Work! Thanks for the help, take this reward for helping us. (Experience and Money)', cid)

        elseif msg == "yes" and getPlayerStorageValue(cid, 4288) < 30 then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        end    

    elseif talkstatus == 17 then

        if msg == 'yes' and getPlayerStorageValue(cid, 4290) >= 40 and getPlayerStorageValue(cid, 3287) < 20 then

            setPlayerStorageValue(cid, 3287, 20)

            doPlayerAddMoney(cid, 40*100)

            doPlayerAddExp(cid, 2400)

            selfSay('Nice Work! Thanks for the help, take this reward for helping us. (Experience and Money)', cid)

        elseif msg == "yes" and getPlayerStorageValue(cid, 4287) < 40 then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        elseif msg == 'no' then

            selfSay('Alright! When you finish the work, come back here, and I will give you a reward.', cid)

            talkstatus = 0

        end   

    end 

end 

npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)

npcHandler:addModule(FocusModule:new())

Pronto agora é só colocar o npc pelo mapeditor ou o summonar pra testar. o sistema contem 4 tasks mas só precisa ser feito 2 tasks para poder retirar os seus pontos, os monstros configurados sempre vão dar os pontos então você sempre vai poder trocar pontos mesmo depois de te terminado todas as tasks.

Obs.: o sistema esta configurado pra zombies com digamos level pra utilizar com um servidor normal você tem que editar os monstros no creaturescripts ou criar vários zombies com [lv] no nome exemplo: zombie [1], zombie [2]....

Att+.