Oeric:[sblock]You know Stony is an aberration that can camouflage itself to look like a tunnel, can engulf large size or smaller creatures and suffocate them, and has psionic powers such as arcane eye, bull's strength, cat' grace, bear's endurance, and wall of stone.[/sblock]
Round 294: Oeric heals to 24 hp and dives.
As Oeric approaches the VZ, a wall of stone juts out from the zone's southern edge. I'll let Stony define the parameters of the wall. Oeric avoids any damage from the collision with the wall (natural 20 Ref save), but falls prone at 65N65E and takes 5 points of falling damage.
Stony starts round 295. Oeric has 19 hp.