Savage Trollspawn gets +1 for each damaged character the engaged player controls.
Shadow: Attacking enemy gets +1 for each damaged character the defending player controls.
For each excess point of combat damage dealt by Cruel Mountain-troll (damage that is dealt beyond the remaining hit points of the character damaged by its attack) you must remove 1 progress from each quest card in play.
Trolls were abroad, no longer dull–witted, but cunning...
–The Fellowship of the Ring
Ruthless Hill-troll gets +2 and +2 while it has 3 or more damage on it.
Shadow: Shuffle 1 location with the safe keyword (but not its attached encounter) back into the encounter deck.
You cannot travel to a safe location while Scavenging Stone-troll has no damage on it.
While Scavenging Stone-troll is in the staging area, cards in each player's discard pule cannot leave that discard pile.