Required Creature Type and Subtype: Dragon (earth).
Suggested Alignment: Lawful neutral.
Traits: Blindsense (vibration) 60 feet; darkvision 120 feet; adamantine extension aura (see below); frightful presence (CR 14+, 60 feet + 10 feet per CR); void adaptation; DR 5/adamantine and magic (increase to DR 10/adamantine and magic at CR 9, DR 15/ adamantine and magic at CR 11, DR 20/adamantine and magic at CR 13); immunity to acid; burrow speed of 30 feet; breath weapon (cone 15 feet + 5 feet per 2 CR, 1d8 P + 1d8 per CR); spell-like abilities (CR 8+); spaceflight.
Adamantine Extension (Su)
An adamantine dragon can share some of its trademark toughness with its allies. Allied creatures within 20 feet of an adamantine dragon gain damage reduction equal to one-fifth that of the dragon’s.
Starfinder Alien Archive 3 © 2019, Paizo Inc.; Authors: Saif Ansari, Kate Baker, John Compton, Adam Daigle, Katina Davis, Eleanor Ferron, Crystal Frasier, Leo Glass, Sasha Lindley Hall, Amanda Hamon, Thurston Hillman, James Jacobs, Jenny Jarzabski, Virginia Jordan, Jason Keeley, Natalie Kertzner, Luis Loza, Lyz Liddell, Ron Lundeen, Crystal Malarsky, Robert G. McCreary, Hilary Moon Murphy, Adrian Ng, Joe Pasini, Lacy Pellazar, Samantha Phelan, Jessica Redekop, Simone D. Sallé, Michael Sayre, Owen K.C. Stephens, James L. Sutter, Jason Tondro, Diego Valdez, and Linda Zayas-Palmer.