Living Extension. The tentacle is an extension of C'thun. It acts at the same time as C'thun.
Rooted. The tentacle cannot move once it emerges from the ground. It automatically fails Dexterity saving throws.
Ground Rupture. When the tentacle spawns the ground beneath it erupts. Roll a 1d6, on a 6 the tentacle emerges beneath a creature C'thun can see within range. When the tentacle emerges beneath a creature, that creature must succeed on a DC 18 Dexterity saving throw. On a failed save the creature takes 22 (4d10) bludgeoning damage, or half as much on a success, and the creature is pushed 5 feet away to an unoccupied space. Otherwise the tentacle emerges in a unoccupied area within 500 feet of C'thun.
Dark Touch. The tentacles weapon attacks are magical.
Claw Tentacle. Ranged Weapon Attack: +18 to hit, reach 300 ft., one target. Hit: 21 (6d6) force damage.
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