Source. tales from the yawning portal, page 238

Amphibious. Kalka-Kylla can breathe air and water.

False Appearance. While Kalka-Kylla remains motionless and hidden in its shell, it is indistinguishable from a polished boulder.

Shell. Kalka-Kylla can use a bonus action to retract into or emerge from its shell. While retracted, Kalka-Kylla gains a +4 bonus to AC, and it has a speed of 0 and can’t benefit from bonuses to speed.

Actions

Multiattack. Kalka-Kylla makes two claw attacks.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage, and if the target is a Medium or smaller creature, it is grappled (escape DC 13). Until this grapple ends, the target is restrained. Kalka-Kylla has two claws, each of which can grapple only one target.

large

monstrosity

cr3

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