The giant gorilla moves through trees just as quickly as on the ground, provided it is in a forest with trees large enough to support it.

The creature moves up to 30 meters and makes an attack, rolling two d20s and keeping the better result. If the attack succeeds, in addition to normal damage, a victim of equal or smaller size than the creature must make an opposed Strength check or be Knocked Prone. In that case, the creature tramples (or gores) its victim and the damage is doubled.

When it takes a critical hit or its hit points drop below half, the creature becomes enraged. It ignores pain and fear penalties, gains a +5 bonus to its melee attack score, and +1d6 to its damage. It can still act for one full round after reaching 0 hit points.

On an attack roll of 15-20, if the attack succeeds, the victim must succeed on a Strength or Dexterity check (its choice), DC [10 + the creature's Strength modifier], or be Knocked Prone. The creature reduces all weapon damage it takes (melee or ranged) by 2 (damage reduction 2). Spells deal normal damage.

The creature uses its great size to affect several creatures in front of it with a single blow. If multiple targets are in front of it, its attack affects two creatures (in a 180° arc). Make a single attack roll and compare it to each target's armor class. Its damage reduction increases to 4.