Beats and Echoes
The Seventh Level Nightmare#10 (x2)
When Revealed: Reveal the top X cards of the encounter deck, adding all enemies to the staging area. Discard the other revealed cards without resolving them. X is 2 plus the number of players not engaged with a Goblin enemy.

Eachoes ran along as they hurried forward; and there seemed to be the sound of many footfalls following their own. -The Fellowship of the Ring