Is a permanent ethreal unit possible?

I was wondering if its possible to make a unit that is always ethreal. I'm not talking about a skll, like the spirit walker's, but I'm talking like when the unit is trained it comes out and is ethreal. Is there an ability I can give to make it ethreal or is there a place in the unit editor. Any help is appreciated :D

~IngeniousMask

i believe theres a neutral hostile spell called "ethereal". I dont know if it makes the unit transparaent though.

I do NOT know if there is such an ability, but you should scroll trough unit ability list and look for Etheral, which I'd hope works like Invulnarable which renders the unit premanently...

If not, you can set the effect on the unit, in one way or another, every time it runs out...

Regards
Dead-Inside

giving any unit the Ethreal ability makes it ethreal - Transperant, immune to physical damage, cannot attack and take extra damage from magical attacks.