thedungeondelver
Adventurer
T. Foster said:Aha! Found it! OD&D balrog stats (from an old Dragonsfoot post):
The MONSTER MANUAL entry appears, then, to be an amalgam of the DUNGEONS & DRAGONS and SUPPLEMENT III: ELDRITCH WIZARDRY entries.
(I didn't know about the prior entry in D&D, thanks for pointing that out TF.)