Giant Ape

A giant ape on the party's side is a druid in Conjure Animals or a high-tier wild shape, a freed prisoner from a circus or arena that now follows them at a respectful distance. The cleanest framing is the freed prisoner: the ape remembers the cage, remembers who broke it, and shows up at the worst moment to help. It does not understand Common. It understands tone, gesture, and the people who fed it.

In combat the value is the same as the adversary version, just pointed the other way. Athletics plus 9 grapples are how this beast contributes. Direct it at a single high-priority target: the ogre, the wight captain, the war wizard who keeps casting Hold Person. Once the ape has them, it climbs the nearest tree or wall with the target in tow, and the party's main fight gets significantly easier. Its Multiattack opens doors when the target is already grappled. With no special damage modifier and AC 12 the ape, raw strikes are not the gameplan. The grapple is.

The ape will not enter buildings, will not cross rope bridges, and will not abide loud magic. Fireballs going off near it is a real problem, since the ape might charge the wizard who cast one. If the players want to keep it around, they need to communicate before the spell, not after. A wild beast does not understand friendly fire.

When the ape leaves, it leaves in the direction of the deepest forest on the map. Players who try to follow lose the trail in a quarter mile. The ape goes back to wherever apes come from in your world, and the players should feel the weight of that choice.

A giant ape is a Huge beast that runs the encounter through raw strength and position. Str 23, 168 HP, AC 12, walk and climb both 40 ft., Athletics plus 9. Its Multiattack throws two Fist attacks at plus 9 for 3d10+6 bludgeoning each. Boulder Toss is available if the ape can see clear ground, DC 17 Dex save, 7d6 bludgeoning in a 5-foot radius, knockdown on Large or smaller, recharge 6.

Run it from elevation. The ape enters by dropping from a tree, swinging off a cliff, or tearing the roof off a structure. Once it has a target, the opening move is grapple. Athletics plus 9 is hard for a level 5 party to beat, and an ape that picks up the wizard and climbs 40 ft. up a trunk has just removed the spellcaster from the fight. On a later turn, drop them. Falling damage from 40 feet is 4d6 bludgeoning, and the ape can keep grappling whoever is left on the ground while the wizard takes the elevator down. With AC 12 and no resistances, a giant ape dies fast under focused fire, so every grapple turn counts.

The 168 HP and absence of damage immunity means the party can chew through this in three rounds if they coordinate. The ape's panic trigger is being Bloodied while a melee character is in its face. It will drop whoever it grappled, climb the nearest vertical surface, and crash off into terrain the party cannot follow. Don't have it die in the open. An ape that limps off into a canyon is a session-three callback for free.

Describe the smell. Wet fur, copper, breathing that is too loud and too close. The ape is not a stat block first; it is a body in the room.