Peril.

When Revealed: Either exhaust a hero you control, or engaged Crebain from Dunland.

Forced: After Crebain from Dunland engages a player, reveal the top card of the encounter deck.

When Revealed: Make Blocked Tunnel the active location, returning any previous active location to the staging area.

Action: Exhaust a character with a Weapon attachment to place 3 progress on Blocked Tunnel. (Any player may trigger this effect.)

Across the width and height of the tunnel a vast web was spun, orderly as the web of some huge spider... -The Two Towers

Cannot have attachments.

Forced: When Umbar Pirate Crew engages you, exhaust a character you control.

Shadow: If the active location is a Ship return attacking enemy to the staging area after this attack.

While Winding Stairs is the active location, each enemy in the staging area gets +10 engagement cost.

Travel: Each player must exhaust a character he controls to travel here.

The stairs were high and steep and winding.
–The Return of the King

While Old Water-course is the active location, it gains:"Response: When Old Water-course is explored, reduce each player's threat by 5."

Travel: Each player must exhaust a hero he controls to travel here.

Clambering a few steps up he found a tiny stream of dark water that came out from the hill–side and filled a little bare pool...
–The Return of the King

Surge.

Forced: After Orc of Mordor engages you, exhaust a character you control.

Shadow: Exhaust a character you control.

Guarded.

Action: Exhaust a hero to claim this objective and attach it to that hero when it is free of encounters. (Counts as an attachment with the text: "If detached discard The Old Thrush.

Response: After attached hero exhausts to attack Smaug, discard X cards from hand to reduce Smaug's by X.")

Burn 1.

Travel: If there is 1 active location exhaust a hero to travel here. (There are now 2 active locations.)

Shadow: Add this location to the staging area.

Surge.

Forced: After Warg of Carn D–m engages you, either remove 1 progress from the main quest, or exhaust a character you control.

Up from the dark plain below came the crying of fell voices, and the howling of many wolves
–The Fellowship of the Ring

Forced: After Spiders of Mirkwood engages you, exhaust a character you control.

Shadow: Attacking enemy gets +1 (+2 instead if it has the Spider trait).

While Glade of the Spawn is the active location, it gains:"Forced: After a Spider enemy enters play, each player must choose and exhaust 1 character he controls."

...black even for that forest, like a patch of midnight that had never been cleared away. –The Hobbit

When Revealed: The player guarding Gollum must either exhaust a hero he controls or Web-spinner gains surge.

Shadow: The player guarding Gollum must exhaust a character he controls.

Ambush.

Forced: After Goblin Trapper engages a player, that player must exhaust a character he controls.

Shadow: Add Goblin Trapper to the staging area.

Forced: At the end of the round, each player must either exhaust a hero he controls or place 1 progress token on To the Tower.

Shadow: Return attacking enemy to the staging area after this attack.

Surge. Doomed 1.

When Revealed: Attach to the current quest. (Counts as a Condition attachment with the text:"Forced: After a player engages an enemy, he must either exhaust a character he controls, or remove 1 time counter from the current quest.")

Forced: If Wicked Wolf is dealt a shadow card with a riddle, the defending player must exhaust a character he controls.

Shadow: Return attacking enemy to the staging area after this attack.