Kalka-Kylla

Large Monstrosity, Neutral

AC: 15

Initiative: +1 (11)

HP: 85 (10d10 + 30)

Speed: 30 ft., swim 30 ft.

STR
17 (+3)
DEX
12 (+1)
CON
16 (+3)
INT
15 (+2)
WIS
16 (+3)
CHA
12 (+1)

Skills: Deception +3, Insight +5, Stealth +3

Senses: blindsight 30 ft., Passive Perception 13

Languages: Olman

CR: 3 (XP 700; PB +2)

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.

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Kalka-Kylla

Source: Tales from the Yawning Portal, p. 238 - Licenses and attribution