Cleon
Legend
To what advantage? To allow a combo of lower-level spells to achieve the same result as a high-level spell?
Erm... yes?

If that's the case, I'd like to reserve judgement until we determine the relative CR of these fellas. If they're weaker than the barghest, I could support that idea. Otherwise, I think the barghest's rules should stand.
Well in some respects the AD&D Abysskin is weaker than the same edition's Barghest - fewer HD (5+5 versus 6+6 to 12+12), lower AC (5 versus 3 to -2), fewer attacks, no SLAs (unlike the Barghest), vulnerability to clerics and holy attacks.
The main advantage they have is an energy drain attack.