Can special possesion be made?

i'm thinking of ulimate for a hero possesion. u can take control of an enemy unit or hero and when u feel like getting out there's an icon that says depossesion and ur hero warps out. but if the controlled unit dies so does the hero. NOTE: this will not be used for a mutli-player map

Yes, however, you'll need to do some tricks, as there is no "Possesion" action/function, you just have to simulate it all. Like give control of the target to the caster.

And this is not really a JASS question, as this problem is just as easily solvable in GUI.

~Cubasis

mneh true but it might be easeir with JASS

Not really, especially to somebody unfamiliar with JASS.