Spell sometimes doesnt work...

I have an ability that summons an infernal to an area on attack.

sometimes the infernal stone item stays on the hero and they lose the item tho.

This is the trigger


is there a better way todo this so that wont happen?

If the attacking unit has all 6 slots full you cannot give item to it,

I suggest you swap the item in first slot with that stone.
and after casting is finished, remove the stone and give the slot 1 item back.

But casting abilities by moving items is really a bad idea,
you should you dummy casters.

i couldnt figure out how to cast a spell by a trigger.... you know how?

PS: i did what you recomended just the item sometimes didnt get given back...

Ok general guide for using dummy casters:

You probably read a tutorial on dummy casters,
if you haven't search for one and read it.

The problem with dummy casters is that people
try it and it NEVER works the first time, so they give it up.

When you order the dummy to cast a spell it can fail for several reasons:

1. dummy has not enough mana (you forgot to set it properly)
2. spell has tech-tree requirements that are not researched,
3. you created dummy too far from target and a spell cannot reach
4. you destroyed dummy caster before it could finish casting a spell

All 4 problems have I common cause: Dummy casters are Invisible.
And they should be, but ONLY when you release the map

When you create the map just make a dummy caster INVULNERABLE
do not make it INVISIBLE or LOCUST.

Before you try to order the dummy to cast with a trigger
preplace one dummy on the map and try to cast the spell yourself,
you will detect most of the problems this way.

When you want to release your map
add INVISIBLE and LOCUST to the dummy

actually the way i was doing it was to add summon infernal to teh caster then cast it then remove it... couldnt get it to cast the spell tho...

You cannot order the cast of inferno from item
You must use inferno that undead dreadlord has.

EDIT:
No I am wrong, you must use this
Unit - Order (Triggering unit) to Special Warlock - Inferno (Target point of ability being cast)

So it is not dreadlord inferno it is warlock inferno you must use.

thanks the last one worked