Deep Maelstrom
The Thing in the Depths Nightmare #8 (x3)
Perfidia

When Revealed: For each location in play that is not grappled, reveal the top card of the encounter deck. If no cards are revealed by this effect, Deep Maelstrom gains Doomed 5. Cannot be canceled.

Shadow: Attacking enemy gets +1 Attack for each enemy grappled with a location.