I did a bit more mucking around on that site and I pieced together the following:
You tread water, looking for any sign of land, when something brushes against your leg. Spend 1 gate trophy, 5 toughness worth of monster trophies, or 3 Clue tokens. If you cannot, you are devoured.
The light of the moon seems to bend and twist the night around you into fearsome shapes. Pass a Will(-2) check or lose 1 Sanity and 1 Stamina.
For once, fortune is with you. No encounter.
Does this card exist? It should have a red border.