Multiattack. The chimera makes one Ram attack, one Bite attack, and one Claw attack. It can replace the Claw attack with a use of Fire Breath if available.
Bite. Melee Attack Roll: +7, reach 5 ft. Hit: 11 (2d6 + 4) Piercing damage, or 18 (4d6 + 4) Piercing damage if the chimera had Advantage on the attack roll.
Claw. Melee Attack Roll: +7, reach 5 ft. Hit: 7 (1d6 + 4) Slashing damage.
Ram. Melee Attack Roll: +7, reach 5 ft. Hit: 10 (1d12 + 4) Bludgeoning damage. If the target is a Medium or smaller creature, it has the Prone condition.
Fire Breath (Recharge 5–6). Dexterity Saving Throw: DC 15, each creature in a 15-foot Cone. Failure: 31 (7d8) Fire damage. Success: Half damage.