The Sea of Grass

From publisher blurb:

Totally rewritten the Sea of Grass is an opportunity to explore a maze of watery passageway through a sea of grass in search of a lost treasure.This adventure unit is for use by a gamemaster in guiding the player characters through the adventure. This adventure might require two gaming sessions. Depending on the actions of the player characters. This adventure may, depending on the players choices,require experienced combat against the Quillian, a very dangerous foe.