The Fire Worm
The Wilds of Rhovanion#80 (x1)
3A-B (-)
When Revealed: Search the encounter deck and discard pile for a Dragon treachery and attach it to Fire-drake, if able. Shuffle the encounter deck.

The cavern around you trembles as the dragon roars and spews fire from its mouth. For a moment, the terrifying form of the beast is lit by red-orange flame and it all becomes clear to you: the huge fire-drake must be responsible for the upheaval you’ve encountered in Wilderland. The Iron Hills and the realm of Dale will not be safe until the dragon is dead.
Ignore the Deep keyword.

Forced: After a player declares X attackers against Fire-drake, he must remove X progress tokens from the main quest or cancel the attack.

This stage cannot be defeated while Fire-drake is in play. If Fire-drake is defeated, the players win the game.