Thunderbird

Huge monstrosity, lawful neutral

Armor Class 16

16 Hit Points 128 (15d8+60)

128 (15d8+60) Speed 15ft., fly 80ft.

STR DEX CON INT WIS CHA 20 (+5) 22 (+6) 18 (+4) 5 (-3) 14 (+2) 9 (-1)

Skills Insight +5, Perception +5

Insight +5, Perception +5 Damage Immunities Lightning, Thunder

Lightning, Thunder Senses Truesight 120ft., passive Perception 15

Truesight 120ft., passive Perception 15 Languages None

None Challenge 8

Keen Sight. The thunderbird has advantage on Wisdom (Perception) check that rely on sight.

Eye of the Storm. The thunderbird has truesight out to 120ft.

Heart of the Storm. The thunderbird is constantly ringed by storm clouds while flying. From the outside, the storm appears to be a regular, if fast moving, thunderstorm. A creature inside or beneath the storm can make a DC 12 Intelligence (Investigation) check to discern the creature at the centre of the cloud.

Born of Lightning The thunderbird can cast Call Lightning at will, (spell save DC 13). When the thunderbird casts Call Lightning, it can use itself as the origin point for the spell, and is always considered to be controlling a natural storm.

Denizen of the Air. If the thunderbird is in contact with the ground, it has disadvantage on attack rolls, ability checks and saving throws.

Actions

Multiattack. The thunderbird makes two attacks, one with its beak and one with its talons.

Beak. Melee Weapon Attack: +8 to hit, reach 10ft., one target. Hit 14 (2d8+5)

Talons. Melee Weapon Attack: +8 to hit, reach 5ft., one target. Hit 12 (2d6+5)

Legendary Actions

The Thunderbird has two legendary actions, choosing from the list below. Only one legendary action option can be used at a time, and only at the end of another creature's turn. The thunderbird regains spent legendary actions at the beginning of its turn.

Updraft. The thunderbird can move up to its speed vertically upwards. This movement does not provoke attacks of opportunity.

Talon. The thunderbird makes one attack with its talons.

Thunderous Rebuke. (Costs 2 actions). The thunderbird lets out a deafening screech at a creature that damaged it this turn. The creature must make a DC 15 Constitution saving throw or take 21 (6d6) thunder damage and be deafened for one minute. On a successful save, it takes half damage and is not deafened.