Surge.

Shadow: Wolf Rider attacks the defending player. That player may declare 1 character as a defender. Deal Wolf Rider its own Shadow card. After combat, return Wolf Rider to the top of the encounter deck.

Excess combat damage dealt by Hill Troll (damage that is dealt beyond the remaining hit points of the character damaged by its attack) must be assigned as an increase to your threat.

"Mutton yesterday, mutton today, and blimey, if it don't look like mutton again tomorrow."
–Troll, The Hobbit

During the encounter phase, players cannot optionally engage Goblin Sniper if there are other enemies in the staging area.

Forced: If Goblin Sniper is in the staging area at the end of the combat phase, each player deals 1 point of damage to 1 character he controls.

Forced: Each time Marsh Adder attacks you, raise your threat by 1.

Under the boughs of Mirkwood there was deadly strife of Elves and Men and fell beasts.
–The Fellowship of the Ring

Forced: If Wargs is dealt a shadow card with no effect, return Wargs to the staging area after it attacks.

Shadow: attacking enemy gets +1 (+2 instead if this attack is undefended.)

When Revealed: Remove 4 progress tokens from the current quest card. (If there are fewer than 4 progress tokens on the quest, remove all progress tokens from that quest.)

Shadow: Defending character does not count its

Forced: After the players travel to The Brown Lands, place 1 progress token on it.

They had come to the Brown Lands that lay, vast and desolate, between Southern Mirkwood and the hills of the Emyn Muil. What pestilence or war or evil deed of the Enemy had so blasted all that region even Aragorn could not tell.
–The Fellowship of the Ring

When faced with the option to travel, the players must travel to The East Bight if there is no active location.

"...to the east the lands are waste, and full of Sauron's creatures..."
–Haldir, The Fellowship of the Ring

Forced: After Misty Mountain Goblins attacks, remove 1 progress token from the current quest.

Shadow: Remove 1 progress token from the current quest. (3 progress tokens instead if this attack is undefended.)

When Revealed: Reveal X additional cards from the encounter deck. X is the number of players in the game.

Shadow: Deal X shadow cards to this attacker. X is the number of players in the game.

Forced: If Banks of the Anduin leaves play, return it to the top of the encounter deck instead of placing it in the discard pile.

Here and there through openings Frodo could catch sudden glimpses of rolling mounds, and far beyond them hills in the sunset, and away on the edge of sight a dark line, where marches the southernmost ranks of the Misty Mountains.
–The Fellowship of the Ring

Forced: While Gladden Fields is the active location, each player must raise his threat by an additional point during the refresh phase.

"On a time they took a boat and went down to the Gladden Fields, where there were great beds of iris and flowering reeds."
–Gandalf, The Fellowship of the Ring

Grimbeorn the Old does not exhaust to defend against Troll enemies.

If Grimbeorn the Old has 8 or more resource tokens on him, he joins the first player as an ally.

Action: Spend 1 resource to place that resource on Grimbeorn the Old.

While Louis is engaged with a player, all Troll enemies gain

"Forced: After this enemy attacks, the defending player must raise his threat by 3."

Response: After defeating Louis, you may choose and discard 1 “Sacked!” card from play.

While Morris is engaged with a player, all Troll enemies get +1

Response: After defeating Morris, you may choose and discard 1 “Sacked!” card from play.

While Stuart is engaged with a player, all Troll enemies get +1

Response: After defeating Stuart, you may choose and discard 1 “Sacked!” card from play.

Forced: After Rupert attacks, shuffle all copies of the “Sacked!” card from the discard pile back into the encounter deck.

Response: After defeating Rupert, you may choose and discard 1 “Sacked!” card from play.

Forced: If Muck Adder damages a character, discard that character from play.

Shadow: Defending character gets -1 for the duration of this attack.

Immune to player card effects.

Players cannot travel to The Carrock except through quest card effects.

While The Carrock is the active location, Troll enemies get +1 and +1

While it is in the staging area, River Langflood gets +1 for each Troll enemy in play.

Response: After you travel to Bee Pastures, search the encounter deck and discard pile for Grimbeorn the Old and add him to the staging area. Then, shuffle the encounter deck.

While Oak-wood Grove is the active location, resource tokens from any sphere may be spent as resource tokens.

When Revealed: Each player raises his threat by the total of all cards in the staging area. Any player may choose to discard from play 1 Creature card he controls to cancel this effect.

Then, one of the ponies took fright at nothing and bolted. –The Hobbit

When Revealed: Attach to a hero with no “Sacked!” cards attached controlled by the first player. (Cannot be canceled.) Counts as a Condition attachment with the text:

Attached hero cannot attack, defend, commit to a quest, trigger its effect, or collect resources.

Shadow: If attacking enemy is a Troll resolve this card's 'when revealed' effect.

When Revealed: Destroy all heroes with the card “Sacked!” attached. Then, shuffle Roasted Slowly back into the encounter deck.

Shadow: If attacking enemy is a Troll remove 2 damage tokens from it.

While Savage Hill-troll is in the victory display, each Troll enemy gets +1 hit point.

Shadow: If attacking enemy is a Troll defending character does not ready during the refresh phase this round.

Forced: After Rob and Bob makes its first attack each round, if there are two or more players, it engages the next player and makes an additional attack (discard and deal a new shadow card for this attack).

Yes, I am afraid trolls do behave like that, even those with only one head each. –The Hobbit

Forced: After Louis attacks, the defending player must raise his threat by 3.

While Louis is in the victory display, each Troll enemy gains,"Forced: After this enemy attacks, the defending player must raise his threat by 1."

Immune to player events.

While Morris is in the victory display, each Troll enemy gets +1 and gains "Immune to player events.".

Rupert's cannot be reduced.

While Rupert is in the victory display, the of each Troll enemy cannot be reduced.

Cannot have player attachments.

While Stuart is in the victory display, each Troll enemy gets +1 and gains "Cannot have player attachments."

While Troll Lair is in the staging area, players cannot reduce their threat.

Shadow: If attacking enemy is a Troll remove 4 damage tokens from it.

Forced: After any amount of progress is placed on Hives and Hives, deal 1 damage to each character in play.

Shadow: Attacking enemy gets +2

There was a buzzing and a whirring and a droning in the air. Bees were busy everywhere. And such bees! Bilbo had never seen anything like them. –The Hobbit

When Revealed: The first player chooses a hero in any player's discard pile and removes that hero from the game. Then, heal all damage from each Troll enemy in play. If no damage is removed from any Troll enemy as a result of this effect, Time for Supper gains surge.

In the end they decided to mince them fine and boil them. So they got a black pot, and they took out their knives. –The Hobbit