Magic Resistance. The celestial snake advantage on saving throws against spell and other magical effects.
Innate Spellcasting. The celestial snake's innate spellcasting ability is Charisma (spell save DC15). It can innately cast the following spells, requiring no components:
At will: dissonant whispers, hold person
1/day each: dominate monster, eyebite
Magic Weapons. The celestial snake's attacks are magical.
Bite. Melee Weapon Attack: +7 to hit, reach 15 ft., one creature. Hit: 11 (2d10 + 6) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 14 Dexterity saving throw or be swallowed by the whale. A swallowed creature has total cover against attacks and other effects outside the whale, and it takes 3 (1d6) acid damage at the start of each of the whale's turns. If the whale takes 30 damage or more on a single turn from a creature inside it, the whale must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall pronein a space within 10 feet of the whale. If the whale dies, a swallowed creature can escape from the corpse by using 20 feet of movement, exiting prone.
Constrict. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 13 (2d12 + 6) bludgeoning damage, and the target is grappled (escape DC 16). Until this grapple ends, the creature is restrained, the celestial snake can constrict up to two targets.
Mind Blast (Recharge 5-6). The celestial snake magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 15 intelligence saving throw or take 22 (4d8 + 4) psychic damage and be stunned 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
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