Astral creatures are natives of the Astral Plane, a vast silvery void between planes.
Traits: DR/— with a value equal to creature’s CR - 10 (minimum DR 1/—); when the creature isn’t on the Astral Plane, it gains the extraplanar subtype.
Starfinder Alien Archive © 2017, Paizo Inc.; Authors: John Compton, Adam Daigle, Crystal Frasier, Amanda Hamon Kunz, Jason Keeley, Jon Keith, Steve Kenson, Isabelle Lee, Lyz Liddell, Robert G. McCreary, Mark Moreland, Joe Pasini, F. Wesley Schneider, Owen K.C. Stephens, James L. Sutter, and Josh Vogt.