Playable on a company at or moving to a Ruins & Lairs [R] or Under-deeps site if you discard an Animal or Spider creature from your hand. Tap all untapped characters in the company with a mind less than 2 plus the number of Spawn cards in play. Eliminated Spawn do not count. Does not affect Wizards or Ringwraiths.
"...a foul reek, as if filth unnameable were piled and hoarded in the dark within."
-LotRIV