Giant Aukashungi

When flipped on its back, a giant aukashungi can't move and its soft underbelly becomes exposed. Whenever a creature critically succeeds at a melee attack roll to Strike a giant aukashungi, the attacking creature can forgo the bonus damage to flip over the giant aukashungi (all other critical hit effects apply normally, such as critical specialization effects). While flipped over, the giant aukashungi can't use reactions, can't Stride or Strike, takes a -2 circumstance penalty to AC and saving t

The giant aukashungi releases an acidic gas from its ventral glands in a 30-foot area. Each creature that starts its turn in the area takes 10d8 acid 2d8 persistent acid (DC 32 fortitude save). The gas moves 10 feet away from the giant aukashungi each round and lasts for 1 minute. The giant aukashungi can't use Acidic Effluence again for 1 minute.

The aukashungi protects its soft underbelly by rolling into a tight ball. The aukashungi gains a +2 circumstance bonus to AC while Rolled Up, but it cannot Stride or Strike, and it rolls downhill if on a slope. If the aukashungi is grappling a creature when it Rolls Up, that creature must succeed at a DC 35 fortitude save or become Swallowed Whole.

The aukashungi can unroll with a single action (this action has the move trait).

Large, (15d6+6)[bludgeoning], Rupture 27