Goblin Shark is a species of friend shark in Abyssrium. He was added in the 1.2.1 version, as part of the Halloween event. The goblin shark will kill on sight, however they're rarely seen and there nothing to worry about.
To unlock goblin shark it's necessary to share a picture of a tombstone 3 times.
Tombstones only appear during the Halloween event, and only if Corallite is level 1000 or higher.
Goblin shark is a very mysterious shark, and is the only living member of the family Mitsukurinidae, and it's consiredated to be a living fossil. They live in the depths normally in submarine canyons or continental slopes, so it's rarely seen. Goblin sharks' diet is mainly composed of teleosts, cephalopods and crustaceans.