Sentinel.

Response: After an enemy is revealed from the encounter deck, ready Gimli.

"Give me a row of orc-necks and room to swing and all weariness will fall from me!"
–The Two Towers

Ranged.

Response: After Legolas participates in an attack that destroys an enemy, draw 1 card.

"He stands not alone," said Legolas, bending his bow and fitting an arrow with hands that moved quicker than sight. –The Two Towers

Combat Action: Ready Háma. He gets +3 until the end of the phase. At the end of the phase, discard Háma. (Limit once per round.)

"I am the Doorward of Théoden," he said. "Háma is my name." –The Two Towers

Response: After a Rohan ally you control is discarded from play, exhaust Gamling to return that ally to your hand.

"...we have a thousand fit to fight on foot," said Gamling, an old man, the leader of those that watched the Dike. –The Two Towers

Sentinel.

Response: After Beregond defends an attack and takes no damage, reduce the defending player's threat by 1. (Limit once per round.)

“The Lord does not permit those who wear the black and silver to leave their post for any cause...”
–The Return of the King

Combat Action: Discard Grimbold to choose an enemy engaged with a player. That enemy cannot attack that player this phase.

Grimbold's men turned aside and passed round to a great gap in the wall further eastward.
–The Return of the King

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

Action: Spend 1 resource from a Rohan hero's resource pool to put Elfhelm into play from your hand under your control. At the end of the phase, discard Elfhelm if he is still in play.

"...my lord sends word that we must set ourselves in readiness; orders may come for a sudden move."
–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.