Large elemental, neutral

Armor Class 20
Hit Points 336 (24d10+204)
Speed 40 ft., burrow 40 ft. ft.

28 (+9) 10 (+0) 27 (+8) 6 (-2) 16 (+3) 22 (+6)

Skills Perception +8
Damage Immunities acid, fire
Condition Immunities exhaustion, paralyzed, petrified, poisoned, unconscious
Senses darkvision 60 ft., tremorsense 60 ft., passive Perception 18
Challenge 16 (15000 XP)


  • Intrastellar. The 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. The diamantem is immune to the harmful effects of bright light, including effects that blind with light and other light effects such as prismatic spray.
  • Radiant Light. The diamantem emits light as a torch.


  • Multiattack. The diamantem makes 2 slam attacks and one prismatic beam attack.
  • Slam. Melee Weapon Attack: +14 to hit, 10 ft. reach, 1 target. Hit: 45 (8d8 + 9) slashing damage. and is not subject to resistance or immunity unless the target is resistant or immune to magic bludgeoning, piercing, and slashing damage.
  • Prismatic Beam. The diamantem projects a beam of prismatic light to one target within 60 ft. The target suffers the effects of prismatic spray (DC 19).


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. Stardwellers. Star 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 (5E) © 2020, Legendary Games; 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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