Amphibious. The crab can breathe air and water.
Claw. Melee Attack Roll: +3, reach 5 ft. Hit: 4 (1d6 + 1) Bludgeoning damage. If the target is Medium or smaller, it has the Grappled condition (escape DC 11). The crab has two claws, each of which can grapple one target.
Sentries: The Korja angles its shell forward and give's its undead sentries a clear shot. Theundead sentries raise a finger and point towards one creature within 60 feet. The
creature must make a DC 12 Constitution saving throw and take 3d8 necrotic
damage on a failed save, or half as much on a successful one
Shift.
The Korja summons a portal to a creature it has seen before that is within its 250
feet of it and teleports to it. The Korja can only do this twice a day.