local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
setCombatParam(combat, COMBAT_PARAM_BLOCKARMOR, true)
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_WEAPONTYPE)
setCombatParam(combat, COMBAT_PARAM_USECHARGES, true)

function onCastSpell(cid, var)

    local pid = getCreatureTarget(cid)
    if isCreature(pid) then
        pos = getThingPos(pid)
        doSendMagicEffect(pos, 40)
        if math.random(100) == 1 then
            doTargetCombatHealth(cid, pid, COMBAT_PHYSICALDAMAGE, -getCreatureHealth(pid), -getCreatureHealth(cid), 10)
        else
            doCombat(cid, combat, positionToVariant(pos))
        end
    end

    return true
end