This glittering crystal creature is vaguely humanoid in form, sparkling with multicolored radiance from within even as it gathers all light around it and throws it back in a radiant display.

Diamantem CR 16

XP 51,200
N Large outsider (earth, elemental, fire)
Init +4; Senses darkvision 60 ft., see in darkness, tremorsense 60 ft.; Perception +22
Aura radiant light (30 ft.)


AC 31, touch 15, flat-footed 31 (+6 deflection, +16 natural, -1 size)
hp 248 (16d10+160); hardness 10
Fort +20, Ref +11, Will +12
Defensive Abilities intrastellar, light immunity; Immune acid, fire, prismatic spells and effects; SR 27


Speed 40 ft., burrow 40 ft.
Melee 2 slams +26 (3d8+16/19-20)
Ranged prismatic beam +15 (see below)
Space 10 ft.; Reach 10 ft.
Special Attacks prismatic beam (DC 24)


Str 33, Dex 10, Con 31, Int 6, Wis 16, Cha 23
Base Atk +16; CMB +28; CMD 38
Feats Bleeding CriticalB, Furious Focus, Improved Critical (slam), Improved Initiative, Iron Will, Power Attack, Vital Strike
Skills Perception +22


Diamond Edge (Ex)

A diamantem’s body is composed of compressed carbon, with features chipped to sharp edges by the constant rolling pressure inside the star that formed them. Its natural weapons deal bludgeoning, piercing, and slashing damage. In addition, the diamond-tipped ridges across a diamantem’s body slice through its opponents easily. It gains Bleeding Critical as a bonus feat.

Intrastellar (Ex)

A diamantem is immune to any effect related to fusion, gravity, light, and pressure. It can move and see normally in the natural conditions of their home.

Light Immunity (Ex)

Diamantems are immune to the harmful effects of bright light (including effects that blind or dazzle with light); all effects with the light descriptor; and other light-based attacks such as color spray, prismatic spray, and searing light.

Prismatic Beam (Su)

Once per round when it uses the attack or full-attack action, a diamantem can shoot a ray of multicolored light at a target within 60 feet as a free action. This functions like a prismatic spray spell except that the diamantem can only target one creature each round. The save DC is Charisma-based.

Radiant Light (Su)

A diamantem’s body reflects and amplifies ambient light, increasing the illumination level within 30 feet by one step. Within this area, all creatures are dazzled (no save), and the penalty on attack rolls and Perception checks increases by 1 for every step of illumination that exists above magical darkness, to a maximum of -4 in bright light.


Environment any space
Organization solitary, pair, or spire (3-8)
Treasure none

Diamantems manifest where elemental energies of earth and fire exist in extreme supply. The dense hearts of some dying stars provide the perfect home for these beings of compressed carbon and dazzling light. Native to their unusual homes, they engage in the processes of fusion or increasing gravity and defend their homes against any intruders who can survive their lethal environment.

Section 15: Copyright Notice

Legendary Planet Adventure Path © 2019, Legendary Games; Authors: Authors: Matt Goodall, Jim Groves, Steven T. Helt, Tim Hitchcock, Jason Nelson, Richard Pett, Tom Phillips, Mike Shel, Neil Spicer, Mike D. Welham.

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