While poking through some old tabletop RPG bestiaries I found that the D&D Creature Catalogue from 1986 (which had a revised edition as Creature Catalog in 1993) includes a monster called "Sabreclaw" with a blade for a right hand. However, the description is otherwise rather dissimilar (a black, hairy, winged monster). On the other hand, this is the accompanying illustration, which has a pointed head, large jaw and what looks like some sort of innate armor plating.
Nothing conclusive enough to add to the page I suppose (there's also been speculation that the Heretic monster is inspired off of H.R. Giger's Xenomorph) but something I'd file under "stuff I'd ask Raven". -- ETTiNGRiNDER (talk) 14:22, 19 March 2015 (UTC)