[ACKS Monster] Horned Ape

I love Russ Nicholson's art in the Fiend Folio, and I was checking out his website. This picture spoke to me, sufficiently to hammer out a monster to match it. I hope you enjoy-

Horned Ape
Lair: 19+
Dungeon: Troop (1d6)/Den (2d10)
Wilderness: Band (2d4)/Den (2d10)
Alignment: Chaotic
Movement: 120' (40')
AC: 3
Hit Dice: 3
Attacks: 3 (slam, slam) or 1 (horn gore)
Damage: 1d4/1d4 or 1d8
Save: F2
Morale: 0
TT: A (in Den)
XP: 50

Long ago,  the inhuman "Green Monks" came to the world of Rhule from unknown dimensions, and stole primitive human women for their own carnal desires. The resulting progeny- beautiful, eldritch crossbreeds- were valuable as concubines, and sold as slaves across the three worlds.

Eventually, the race of the Green Monks ascended, leaving their physical husks behind, their twisted cities empty, and their slave-races bereft of civilization. Over time, the crossbred children ceased to breed true. Future generations birthed abominations- bestial ape-like forms with a single, massive horn arching from their foreheads.

Many of these horned apes survive in ruined, nameless cities throughout the southern continents of Talis.

Art by Russ Nicholson