Pack Tactics. The baboon has advantage on an attack roll against a creature if at least one of the baboon's allies is within 5 feet of the creature and the ally isn't incapacitated.
Limb Withering. For each successful bite of the baboon ghoul, the PC must make a DC12 Constitution save. Failure indicates one of their limbs immediately becomes desiccated like a mummy's. Affected limb is the one bitten (or chosen at random by DM). PCs with withered limbs suffer a -1 to hit and spell checks; two withered limbs are -2 to hit and spell checks, etc. The withering lasts 1d4 turns.
Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 2 (1d4) piercing damage.
Claw. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 1 (1d3) slashing damage.