Sentinel. The first player gains control of Aragorn.

Action: Spend 1 resource from Aragorn's pool to ready him. (Limit once per phase.)

If Aragorn leaves play the players lose the game.

“As I have begun, so I will go on.”
–The Return of the King

Response: After Éomer commits to the quest, spend 1 resource from his resource pool to immediately declare him as an attacker (and resolve his attack) against an enemy in the staging area.

...he was young, and he was king; the lord of a fell people.
–The Return of the King

Gimli gets +1 for each damage token on him.

Ranged.

Response: After Legolas participates in an attack that destroys an enemy, place 2 progress tokens on the current quest.

Action: Raise your threat by 1 to ready Boromir.

Action: Discard Boromir to deal 2 damage to each enemy engaged with a single player.

Action: Pay 1 resource from Glorfindel's pool to heal 1 damage on any character. (Limit once per round.)

Sentinel.

Lower the cost to play Weapon and Armor attachments on Beregond by 2.