Hræsvelgr (5e Creature)
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Gargantuan monstrosity, lawful evil
Saving Throws Str +15, Dex +13, Int +8, Wis +12
Legendary Resistance (3/Day). If the hræsvelgr fails a saving throw, it can choose to succeed instead.
Multiattack. The hræsvelgr can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 10 (3d6) poison damage. If the target is a Large or smaller creature grappled by the hræsvelgr, that creature is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the hræsvelgr, and it takes 35 (10d6) acid damage at the start of each of the hræsvelgr's turns.
Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 22 (4d6 + 8) slashing damage.
Tail. Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.
Frightful Presence. Each creature of the hræsvelgr's choice that is within 120 feet of the hræsvelgr and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the hræsvelgr's Frightful Presence for the next 24 hours.
The hræsvelgr 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 hræsvelgr regains spent legendary actions at the start of its turn.
Detect. The hræsvelgr makes a Wisdom (Perception) check.