BPLYKSUM.SPL and SPCL106.SPL

Who can tell me what purpose these spells, which I find with Near Infinity in BG:EE, have in the game or games and who or what has them? Are they present in all EE games or maybe only in BG2:EE? In BG:EE searching for references to them gives no results. Both are titled "Animate Dead." Looks like BPLYKSUM has something to do with Dorn - it produces a "Crumbling Skeleton" with a script referring to the new areas. SPCL106 has an internal name, BLACKGUARD_ANIMATE_DEAD, and it is an innate ability. But blackguards get the normal Animate Dead when they level up, don't they? What is this, then?