Uruk Chieftain
The Sands of Harad #61 (x1)
(50) 4 5 3 6
Orc.   Uruk.  

Cannot have player card attachments or be optionally engaged.

While the engaged player is engaged with another Orc enemy, Uruk Chieftain cannot take damage.

Forced: At the end of the encounter phase, Uruk Chieftain engages the player engaged with the most non-unique Orc enemies.