Blighted Leviathan

Hive Mind. The Blighted Leviathan shares a telepathic connection with other Blighted creatures. If one Blighted creature is aware of a hostile creature, all in the hive mind are also aware.

Blighted Scourge. Natural weapon attacks by the Blighted Leviathan carry the Blighted Scourge infection. A creature hit by the leviathan’s attacks must succeed on a DC 20 Constitution saving throw or contract the Blighted Scourge.

Death Burst. When the Blighted Leviathan drops to 0 hit points, it releases a destructive burst of blighted energy. Each creature within 30 feet must make a DC 20 Constitution saving throw, taking 55 (10d10) blighted energy damage on a failed save, or half as much on a successful one. Creatures that fail the saving throw are also infected with the Blighted Scourge.

Aura of Blighted Tides. The Blighted Leviathan radiates a 20-foot aura of corruptive energy. Creatures that start their turn within this area must make a DC 20 Wisdom saving throw or take 13 (3d8) blighted energy damage and be slowed until the start of their next turn. Blighted creatures are immune to this effect.

Tidal Resistance. The leviathan has advantage on saving throws against spells and other magical effects.

Multiattack. The Blighted Leviathan makes two Bite attacks and one Tail attack.

Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 36 (5d10 + 9) piercing damage plus 13 (3d8) blighted energy damage.

Tail. Melee Weapon Attack: +15 to hit, reach 25 ft., one target. Hit: 26 (4d8 + 9) bludgeoning damage. The target must succeed on a DC 20 Strength saving throw or be knocked prone and pushed 10 feet away.

Corrupted Wave (Recharge 5–6). The Blighted Leviathan releases a massive wave of blighted energy in a 60-foot cone. Each creature in that area must make a DC 20 Dexterity saving throw, taking 66 (12d10) blighted energy damage on a failed save, or half as much damage on a successful one. Creatures that fail the saving throw are also pushed back 20 feet.

The Blighted Leviathan 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 Blighted Leviathan regains spent legendary actions at the start of its turn.

• Tail Swipe. The leviathan makes one Tail attack.
• Chilling Roar (Costs 2 Actions). The leviathan lets out a terrifying roar infused with blighted energy. Each creature within 30 feet that can hear it must succeed on a DC 20 Wisdom saving throw or be frightened until the end of its next turn.
• Blighted Surge (Costs 3 Actions). The leviathan releases a burst of blighted energy, increasing the range of its Aura of Blighted Tides to 40 feet until the start of its next turn. Creatures within this area must make a DC 20 Wisdom saving throw or take 18 (4d8) blighted energy damage.