Crocowyrm

Hold Breath. The Crocowyrm can hold its breath for 1 hour.

Avian Alliance. The Crocowyrm treats all non-magical birds as peaceful allies, and birds are naturally drawn to it. Birds can occupy the Crocowyrm's space without penalties. While at least one bird is resting on or cleaning the Crocowyrm, the Crocowyrm gains advantage on Wisdom (Perception) checks, and it cannot be surprised by creatures that the birds can see. Additionally, the Crocowyrm will never willingly harm a bird unless magically compelled.

Multiattack. The Crocowyrm makes one Bite attack and one Tail attack, The Crocowyrm can replace of these attacks with Fire Breath.

Bite. Melee Attack Roll: +8, reach 5 ft. Hit: 21 (3d10 + 5) Piercing damage. If the target is a Large or smaller creature, it has the Grappled condition (escape DC 15). While Grappled, the target has the Restrained condition and can’t be targeted by the crocodile’s Tail.

Tail. Melee Attack Roll: +8, reach 10 ft. Hit: 18 (3d8 + 5) Bludgeoning damage. If the target is a Large or smaller creature, it has the Prone condition.

Fire Breath (Recharge 5–6). Dexterity Saving Throw: DC 21, each creature in a 60-foot Cone. Failure: 59 (17d6) Fire damage. Success: Half damage.