function onCastSpell(cid, var)

local T = {
{level = {from = 10, to = 50}, mana = 300, monster = "karasu"},
{level = {from = 51, to = 80}, mana = 350, monster = "karasu"}
}

local monster = nil

    for _, V in pairs(T) do
        if(#getCreatureSummons(cid) < 1) then
            if(getPlayerLevel(cid) >= V.level.from and getPlayerLevel(cid) <= V.level.to) then
                if(getCreatureMana(cid) >= V.mana) then
                    monster = doCreateMonster(V.monster .. "[" .. _ .. "]", getThingPos(cid))
                    doCreatureAddMana(cid, V.mana)
                    doConvinceCreature(cid, monster)
                    registerCreatureEvent(monster, "summon1")
                else
                    doPlayerSendTextMessage(cid, 27, "You don't have mana.")
                end
            else
                doPlayerSendTextMessage(cid, 27, "You don't have level.")
            end
        else
            doPlayerSendTextMessage(cid, 27, "You can't summon more monsters.")
        end
    end

    return true
end