Crammy the Crab

Amphibious. The crab can breathe air and water.

Mist-Born. The crab has adapted to live in the Mists and Waste, more easily blending into the environment around it, giving it a +2 bonus to stealth checks. 

Claw. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 1d6 bludgeoning damage.

Not-Water Jet. Ranged Attack: +2{"diceNotation":1d20+2","rollType":"to hit","rollAction":"Crossbow"} to hit, range 60ft, line attack, Hit: 2d6 bludgeoning damage. 

Giant Claw. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3d4 bludgeoning damage. 

Crush. Melee Weapon Attack: if player is already grappled, deal 1d4 damage. 

Hazy Shape. The Mist Crabs are tricky creatures, somehow both rocky and organic looking at the same time, making it hard to spot them in the landscape of the Mists. Once per combat, the Crab may attempt to blend itself into the environment in order to get a drop on the players. If the players fail a DC 13 Wisdom save, the crab goes into stealth until it attacks or escapes combat. Its movement speed is reduced by 1/3 during stealth. 

Giant Claw. On a hit with the Giant Claw attack, Crammy gets a free opportunity to grapple the player. For every turn that the player is grappled, Crammy can make a free 1d4 Crush attack against the player.