Beast of Talos

Heated Body. A creature that touches the Beast of Talos or hits it with a melee attack while within 5 feet of it takes 10 (3d6) fire damage. 

Legendary Resistance (3/day): If the Beast of Talos fails a saving throw, it can choose to succeed instead.

Magic Weapons:  The Beast of Talos' weapon attacks are magical.

Force of Nature: If the Beast of Talos doesnt act first in Initiative, it acts second.

Multiattack (Strong and Very Strong Only): The Beast of Talos makes two attacks: one with its bite and one to constrict.

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 40 (6d10 + 7) piercing damage plus 10 (3d6) fire damage. If the target is a creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and the Beast of Taloscan't bite another target.

Swallow. The Beast of Talosmakes one bite attack against a Medium or smaller creature it is grappling. If the attack hits, that creature takes the bite's damage and 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 Beast of Talos, and it takes 21 (6d6) acid damage at the start of each of the Beast of Talos's turns.

If the Beast of Talos takes 30 damage or more on a single turn from a creature inside it, the Beast of Talos must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the Beast of Talos. If the Beast of Talos dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.

Constrict (Strong and Very Strong Only): Melee Weapon Attack: +10 to hit, reach 5 ft., one Large or smaller creature. Hit: 17 (2d10 + 6) bludgeoning damage plus 17 (2d10 + 6) slashing damage. The target is grappled (escape DC 16) if the Beast of Talos isn't already constricting a creature, and the target is restrained until this grapple ends. Creature that are restrained are also subject to the Beast of Talos' Heated Body.

Lightning Breath (Recharge 5–6): The Beast of Talos exhales a line of lightning that is 60 feet long and 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw, taking 66 (12d10) lightning damage on a failed save, or half as much damage on a successful one.

The Beast of Talos 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 Beast of Talos regains spent legendary actions at the start of her turn. The Beast of Talos can’t use the same legendary action twice in the same round.

Bite. The Beast of Talos uses its bite on a creature within reach.

Move. The Beast of Talos moves its speed without provoking opportunity attacks.

Swallow (costs 2 actions). The Beast of Talos uses its swallow attack on a creature within reach.

Lightning Breath (costs 3 actions). The Beast of Talos recharges its Lightning Breath and uses it.