Gundabad Stalker
Ered Mithrin Campaign Expansion #192 (x1)
Enemy
Burden
(40) 4 3 2 5
Orc.   Goblin.   Hazard.  

Gundabad Stalker cannot be optionally engaged except by a player who is engaged with a unique enemy.

Shadow: If attacking enemy is unique, return it to the staging area after this attack.