Mouth of the Oblex

Publisher's blurb: This particular oblex has converted a dungeon into a labyrinth which it calls a "test environment". It lures brave and foolish humanoids in with promises of material gain and then it puts its "test subjects" through a series of trials in order to determine their "edibility". Since this is how it eats, it calls this dungeon laboratory the "Mouth of the Oblex". Are you game?