Amphibious. The crab can breathe air and water.
Crab Pickin'. The four sections of the blue, segmented carapace of the Cthonian Shell can be peeled away. A player in melee range of the Shell may make a DC 18 Strength check. On a success, one of the sections is removed, revealing the Soft Flesh. If all four sections are removed, this action can not be performed.
Soft Flesh. Any part of the Cthonian Shell that has had its carapace removed may be targeted with an attack, assuming all other prerequisites for the attack have been met. The vulnerable area has its own AC of 21, minus 2 for each of the 4 sections removed. A successful attack on the vulnerable area functions as a critical hit.
Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 24 (6d6 + 3) bludgeoning damage, and the target is grappled (escape DC 13). The crab has two claws, each of which can grapple only one target.
Burrow (Recharge 4-6). The Cthonian Shell burrows underground for one turn. On its next turn, the Shell must take its full movement towards the closest moving enemy detected with tremorsense, and Erupt. If the Shell detects no enemies while burrowed, it unburrows in the same location on its next turn and takes no other actions.
Erupt. The Cthonian Shell erupts from the ground where it was burrowed. Enemies within 10 feet must make a DC 15 Dexterity saving throw or be knocked prone. If the Shell Erupts directly beneath a target detected by tremorsense, the target must make a DC 17 Acrobatics or Athletics check: on failure, take 20 (3d12 + 1) bludgeoning damage and be knocked prone; on success, take half damage and be knocked back 10 feet.
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