SRD (p.326)
Hold Breath. The hydra can hold its breath for 1 hour. Multiple Heads. The hydra has five heads. While it has more than one head, the hydra has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.
Multiattack. The hydra makes as many bite attacks as it has heads. Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 10 (1d10 + 5) piercing damage.
Swamp
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