Action: Add He that Walks Unseen to the victory display to choose a non-unique enemy engaged with a player. That enemy cannot attack that player this phase. If there are 3 or more players, choose up to 2 non-unique enemies instead (they can be engaged with different players).

And there was the ring still, in his left pocket, and it slipped on his finger. The goblins stopped short. They could not see a sign of him. He had vanished. —The Hobbit