Forced - After you end your turn at Sea of Skulls: You must either take 1 direct horror or choose and discard 3 cards from your hand.

Forced - When Sea of Skulls is revealed: Put the topmost Catacombs in the Catacombs deck into play above, below, or to the right of the location farthest from Sea of Skulls and mark it with a horror token. For the remainder of the game, Sea of Skulls is connected to the marked location.