Unsummon or Building Foundation

In one of my maps, I would like to make a 'new' ability that is basically unsummon. That part I can do, but the problem is it only works on undead buildings. I can 'fix' that by making all buildings based on the undead Necropolis (so they dont have to be placed on blight), but then they have a large blight-looking foundation. I would like to use the small orc foundation instead, but I can't find a way to change it. I've looked through all the images stored as .blp in the mpq but I didnt see the undead foundation in there. I also tried adding "undead" to the unit classification so I wouldn't have to make the buildings based on the necropolis, but unsummon still wouldnt work on the buildings. I also looked in abilitydata.slk, and unsummon can target buildings and debri of player. It doesnt list 'undead' anywhere in there that I could see.

hmm i think you can do it through trigger

THat blight ground is the ubersplat of the unit. Edit UnitsUI.slk and kill the ubersplat.

Thank you, that helped much =-)