Attach to a character.
Action: Exhaust Self Preservation to heal 2 points of damage from attached character.
...how much more of this would they have to endure, or could they endure?
–The Two Towers
Attach to a Warrior character. Limit 1 per character.
Attached character gets +2 hit points.
Response: When another character would be assigned any amount of damage, place 1 of that damage on attached character instead.
Setup: Attach to a Warrior hero.
Response: After attached hero is declared as the only attacker against a non-unique enemy, exhaust Intimidation to give that enemy -2
for this attack.
"None knows what the new day shall bring him," said Aragorn. "Get you gone, ere it turn to your evil!"
–Aragorn, The Two Towers
Setup: Attach to a Healer hero.
Action: Exhaust attached hero and Hands of a Healer to heal up to 3 damage from a hero.
"Life to the dying
In the king's hand lying!"
–Herb–master, The Return of the King
Setup: Attach to a Ranger hero.
Response: After attached hero is declared as a defender against a non-unique enemy, exhaust Forewarned to discard 1 shadow card from that enemy.
"Faint and far are the feet of our enemies."
–Aragorn, The Two Towers
Setup: Attach to a Noble hero.
Response: After attached hero quests successfully, exhaust Leader of Men to add 1 resource to attached hero's pool.
"Take this, dear lord!" said a clear voice. "It was ever at your service."
–The Two Towers
Attach to a character.
Action: Exhaust Self Preservation to heal 2 points of damage from attached character.
...how much more of this would they have to endure, or could they endure?
–The Two Towers
Attach to a Hobbit character.
Action: Exhaust Fast Hitch to ready attached character.
'And I put as fast a hitch over the stump as any one could have done, in the Shire or out of it.' –Sam, The Two Towers
Attach to a 
hero hero. Limit 1 per hero.
Response: After attached hero attacks and destroys an enemy, deal 1 damage to another enemy that shares a Trait with the enemy just destroyed.
He slew many of them and the rest fled. –The Two Towers
Attach to a Warrior character. Limit 1 per character.
Attached character gets +2 hit points.
Response: When another character would be assigned any amount of damage, place 1 of that damage on attached character instead.
Attach to a hero. Limit 1 per hero.
Attached hero gains the Warrior trait.
Response: After you play Mighty Warrior from your hand, draw a card.
Gimli hewed the legs from another that had sprung up on Balin's tomb.
–The Fellowship of the Ring
Attach to a hero. Limit 1 per hero.
Attached hero gains the Ranger trait.
Response: After you play Doughty Ranger from your hand, draw a card.
...he went forth clad only in rusty green and brown, as a Ranger of the wilderness.
–The Fellowship of the Ring
Attach to a hero. Limit 1 per hero.
Attached hero gains the Scout trait.
Response: After you play Fearless Scout from your hand, draw a card.
...he got right up to the fire–for fire it was–without disturbing anyone. –The Hobbit
Attach to a hero. Limit 1 per hero.
Attached hero gains the Noble trait.
Response: After you play Diligent Noble from your hand, draw a card.
Attach to a hero. Limit 1 per hero.
Response: After attached hero quests successfully, name a card type and discard the top card of your deck. If the discarded card is the named type, take it into your hand.
Setup: Attach to a Warrior hero.
Response: After attached hero is declared as the only attacker against a non-unique enemy, exhaust Intimidation to give that enemy -2 for this attack.
"None knows what the new day shall bring him," said Aragorn. "Get you gone, ere it turn to your evil!"
–Aragorn, The Two Towers
Setup: Attach to a Healer hero.
Action: Exhaust attached hero and Hands of a Healer to heal up to 3 damage from a hero.
"Life to the dying
In the king's hand lying!"
–Herb–master, The Return of the King
Setup: Attach to a Ranger hero.
Response: After attached hero is declared as a defender against a non-unique enemy, exhaust Forewarned to discard 1 shadow card from that enemy.
"Faint and far are the feet of our enemies."
–Aragorn, The Two Towers
Setup: Attach to a Noble hero.
Response: After attached hero quests successfully, exhaust Leader of Men to add 1 resource to attached hero's pool.
"Take this, dear lord!" said a clear voice. "It was ever at your service."
–The Two Towers