From Pathfinder #157: Devil at the Dreaming Palace, which isn't enabled.

Siege Shard

CREATURE 3

Perception +9; darkvision

Skills Athletics +9, Stealth +10

Str +2, Dex +3, Con +2, Int -4, Wis +2, Cha -4

AC 19 ((15 when broken)); Fort +12, Ref +6, Will +9

HP 37

Exorcism

Mental damage ignores a siege shard's hardness.

Additionally, proving the siege shard's generative conflict is over with the Prove Peace activity reverts the creature to ordinary stone.

Hardness 5

Surreptitious Siege

While a siege shard is embedded within a structure while using One with Stone, the structure and all objects within it take twice as long to repair.

Speed fly 25 feet

Melee Slam +11 (unarmed), Damage 1d8+4 bludgeoning

Innate Occult Spells DC 20, attack +12; 3rd Meld into Stone (At Will); 2nd Telekinetic Maneuver; Cantrips (2nd) Mage Hand, Telekinetic Projectile

Overwhelming Anguish (emotion, mental, occult)

Frequency once per minute

Effect The siege shard emits a disorienting psychic blast. All creatures within a 15-foot emanation take 4d6 mental damage (DC 20 basic Will save).

Rejuvenation (occult)

When a siege shard is destroyed within 100 feet of a structure, it reforms after 2d4 days within the nearest structure, fully healed.

A siege shard within a structure can permanently destroyed by the Prove Peace activity.

Pathfinder #157: Devil at the Dreaming PalaceOGL