Hold Breath. The hydra can hold its breath for 1 hour.
Elemental Blood. When the hydra takes piercing or slashing damage, each creature within 5 feet of the hydra takes 9 (2d8) lightning damage.
Innate Spellcasting. The Greater Hydras innate spellcasting ability is Wisdom (spell save DC 18). It can innately cast the following spells, requiring no material components:
At Will: Gust of Wind, Thunderwave, Shape Water
4/Day: Fear, Wall of Water, Tidal Wave, Plant Growth
3/Day: Storm Sphere, Watery Sphere, Control Water, Wall of Fire, Call Lightning, Ice storm, Lightning Bolt
2/Day: Maelstrom, Wrath of Nature, Wall of Thorns
1/Day: Whirlwind, Storm of Vengeance, Fire Storm
Multiple Heads. The hydra has seven heads. Each head can maintain concentration on its own spell, and also has advantage on concentrationchecks. While it has more than one head, the hydra has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.
Whenever the hydra takes 30 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 30 or more Necrotic damage since its last turn. The hydra regains 20 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 hydra sleeps, at least one of its heads is awake.
Legendary Resistance (3/day). If the Greater Hydra fails a saving throw, it can choose to succeed instead.
Multiattack. The hydra makes as many bite attacks as it has heads. It can substitute up to 2 bite attacks to cast spells from up to 2 heads.
Bite. Melee Weapon Attack: +13to hit, reach 15 ft., one target. Hit: 10 (2d10 + 9) piercing damage.
Legendary Actions. The Greater Hydra can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time, and only at the end of another creature's turn. The Greater Hydra regains spent legendary actions at the start of its turn.
Feast. Melee Weapon Attack: +13 to hit with Advantage, Hit: 35 (4d10 + 18) piercing damage. One creature the Hydra is grappling is assaulted with a flurry of Bite attacks.
Grappling Bite. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 20 (2d10 + 9) piercing damage DC18 Strength Save; On hit the creature must succeed a Strength saving throw DC18 or be grappled by one of the Hydras heads. The Greater Hydra can only grapple as many creatures as it has heads.
Throw. The Greater Hydra releases one creature it is grappling by flinging the creature up to 60 feet away in a direction of it's choice. If the flung creature comes into contact with a solid surface, such as a wall or floor, the creature takes 2d6 bludgeoning damage for every 10 feet it was flung.
Lair and Lair Actions
On initiative count 20, the Greater Hydra takes a lair action to cause one of the following effects: The Greater Hydra can't use the same effect two rounds in a row:
• Geysers of freezing water erupt from a point on the ground the Greater Hydra can see within 120 feet of it, creating a 20-foot-high, 5-foot-radius cylinder. Each creature in the geyser's area must make a DC 18 Dexterity saving throw, 8d6 cold damage on a failed save, or half as much damage on a successful one.
• A tremor shakes the lair in a 60-foot-radius around the Greater Hydra. Each creature other than the Greater Hydra on the ground in that area must succeed on a DC 18 Dexterity saving throw or be knocked prone.
• A thick icy fog erupts from the ground to form a cloud in a 20-foot-radius sphere centered on a point the Greater Hydra can see within 120 feet of it. The sphere spreads around corners, and its area is heavily obscured. It lasts until initiative count 20 on the next round. Each creature that starts its turn inside the cloud must make a DC 18 Constitution save or be Blinded until the end of its next turn as the biting cold stings their eyes.
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