Multiattack

The venom maw hydra makes as many bite or spit attacks as it has heads.

Bite

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 7 (1d6 + 4) piercing damage and 5 (2d4) acid damage.

Spit

Ranged Weapon Attack: +7 to hit, range 20/60 ft., one target. Hit: 10 (3d6) acid damage, and the target must succeed on a DC 16 Dexterity saving throw or be poisoned until the end of its next turn.

Venom Spray (Recharge 5-6)

The hydra sprays caustic liquid in a 30-foot cone. Each creature in the area must make a DC 16 Dexterity saving throw, taking 22 (5d8) acid damage on a failed save, or half as much damage on a successful one.