Exclusive to: 
The Terrorclaw is an aquatic Shadow Creature exclusive to Don't Starve Together, introduced in Return of Them.
At low sanity (below 10%), Terrorclaws spawn in place of Terrorbeaks and Crawling Horrors for players sailing the ocean. When a player lands, all Terrorclaws following them transform into Terrorbeaks. Inversely, Terrorbeaks transform into Terrorclaws when the player boards a boat.
Terrorclaws only move in the water and teleport close to the player to attack. When attacked, they do not disappear and continue to attack the player.
Killing a Terrorclaw regenerates 15 
and drops 1 Nightmare Fuel plus a 50% chance of an extra one.