The Swan Hydra

Huge monstrosity, chaotic evil

Armor Class 15

15 Hit Points 207 (18d12 + 90)

207 (18d12 + 90) Speed 30 ft, swim 30 ft, fly 60 ft

STR DEX CON INT WIS CHA 20 (+5) 12 (+1) 20 (+5) 10 (+0) 14 (+2) 16 (+3)

Skills Perception +6

Perception +6 Condition Immunities charmed, frightened

charmed, frightened Senses Darkvision 60 ft, passive Perception 16

Darkvision 60 ft, passive Perception 16 Challenge VERY DANGEROUS

Hold Breath. The swan hydra can hold its breath for 1 hour.

Multiple Heads. The swan hydra has seven heads. While it has more than one head, the hydra has advantage on saving throws against being blinded, deafened, stunned, and knocked unconscious. The swan hydra may grapple as many creatures as it has heads.

Whenever the swan hydra takes 25 or more damage in a single turn, one of its heads dies. If all its heads die, the hydra dies.

At the end of its turn, it grows two heads for each of its heads that died since its last turn, unless it has taken fire damage since its last turn. The hydra regains 10 hit points for each head regrown in this way.

Reactive Heads. For each head the hydra has beyond one, it gets an extra reaction that can be used only for opportunity attacks.

Wakeful. While the swan hydra sleeps, at least one of its heads is awake.

Hateful. Whenever a creature comes within 15 feet of the swan hydra, it flies into a frothing, hissing rage. While enraged, it has resistance to bludgeoning, piercing, and slashing damage and gains a +4 bonus to damage against the creature that provoked it. Its rage lasts 1 minute. It ends early if the swan hydra is knocked unconscious. At the beginning of the swan hydra's turn, it may shift the focus of its hate to any creature within 15 feet. The swan hydra must make at least half of its attacks from the Multiattack feature, rounded up, against the target of its hate.

Spiteful. The swan hydra has advantage on attacks against any creature that provoked an opportunity attack from it last turn.

Powered by Loathing. If the swan hydra fails a saving throw originating from the target of its hatred, it may choose to succeed instead. The swan hydra may use this feature twice per day.

Hostility Is Magic. The swan hydra's attacks are magical against the current target of its hate.

Actions

Multiattack. The hydra makes as many bite attacks and/or hiss attacks as it has heads.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: (1d10 + 5) piercing damage, or the target is grappled by the swan hydra.

Hiss. Ranged Weapon Attack: +7 to hit, reach 30 ft, one target. Hit: (1d10+3) thunder damage.