Concealed Spikes
The Ruins of Belegost#29 (x2)
Treachery
Hazard.  

When Revealed: Each player assigns X damage among characters he controls. X is 1 more than the Discover value on the active location.

Shadow: Assign X damage among characters you control. X is the number of attachments you control. You may discard the highest cost attachment you control to cancel this effect.