No more than 1 progress token can be placed on Perilous Swamp each round

Shadow: Remove 1 progress token from the current quest.

Forced: After you travel to Makeshift Passage, place 2 progress tokens on the current quest card, bypassing any active location.

They reached the strip of dry land between the lake and the cliffs: it was narrow, often hardly a dozen yards across, and encumbered with fallen rock and stones; but they found a way, hugging the cliff, and keeping as far from the dark water as they might.
–The Fellowship of the Ring

When Revealed: Discard the top card of the encounter deck. If the discarded card is a Tentacle enemy, add that card to the staging area and raise each player's threat by 5.

When they came to the northernmost corner of the lake they found a narrow creek that barreed their way. It was green and stagnant, thrust out like a slimy arm towards the enclosing hills.
–The Fellowship of the Ring

While Banks of Sirannon is in the staging area, each Tentacle enemy gets +2

Shadow: For each point of damage dealt by this attack, the defending player must discard a random card from his hand.

Forced: After a player looks at one or more cards in the encounter deck, shuffle the encounter deck.

Travel: Reveal the topmost Tentacle enemy in the encounter discard pile to travel here.