This content comes from Monsters of Porphyra

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Crystalline Horror
This humanoid creature seems to be entirely made of crystal and glass. It is man-sized and its head sports no eyes, nose, ears or mouth. Its body appears razor-sharp and jagged. Its hands end in wicked claws.

Crystalline Horror (CR 5; XP 1,600)
NE Medium aberration
Init +6; Senses darkvision 60 ft.; Perception +11
Defense
AC 18, touch 12, flat-footed 16
(+2 Dex, +6 natural)
hp 52 (7d8+21)
Fort +5, Ref +6, Will +8
DR 10/magic; Resist cold 10
Offense
Speed 30 ft.
Melee 2 claws +9 (1d6+4)
Special Attacks bend light, shard spray, wounding
Statistics
Str 19, Dex 14, Con 16, Int 10, Wis 12, Cha 10
Base Atk +5; CMB +9; CMD 21
Feats Blind-Fight, Improved Initiative, Iron Will, Lightning Reflexes
Skills Acrobatics +12, Climb +14, Perception +11, Stealth +12
Languages Undercommon
Ecology
Environment mountains, underground
Organization solitary
Treasure none
Special Abilities
Bend Light (Ex) By shifting the make-up of its body as a standard action, a crystalline horror can refract natural light into a bright light that radiates out in a 10-foot spread. Affected creatures must succeed on a DC 16 Reflex save or be blinded for 3 rounds. The save DC is Constitution based. Creatures to whom sunlight is harmful or unnatural take 2d6 points of damage from the light. Undead creatures caught within the area take 3d6 points of damage, and undead particularly vulnerable to sunlight – such as vampires – take 3d8 points of damage. Creatures that can not see or perceive objects through the use of vision are unaffected by the blindness, but still suffer damage if they are vulnerable to sunlight.
Shard Spray (Ex) Five times per day a crystalline horror can fire a spray of razor-sharp shards of glass from its body in a 40-foot cone. A creature in the area takes 4d6 points of damage (Reflex save DC 16 for half ). The save DC is Constitution-based.
Wounding (Ex) A crystalline horror that rolls a critical with a claw attack deals an amount of bleed damage equal to its Strength modifier.

A crystalline horror is a weird, unnatural humanoid composed of crystal and glass. How it came to be remains speculation among many sages and scholars, though all agree it is in fact a living creature and not an automaton.

A crystalline horror begins combat using its shard spray before closing for melee. In close-quarters, it uses its razor sharp claws to slash an opponent. If given the opportunity, it uses its ability to bend natural light to blind its opponents. Though it has no visible sensory organs, it is known (by those who have fought them) that a crystalline horror can see and hear normally.

On Porphyra
Crystalline horrors are found most often in the Underdeep or around areas rich in the concentration of porphyrite. They were unheard of before the NewGod War.