Fiendish

Alignment

Any Evil

Traits

DR/good with a value equal to creature’s CR – 10 (minimum DR 1/good)
If the creature already has DR of that value or greater, it instead gains resistance to fire with a value equal to creature’s CR – 5 (minimum fire resistance 1)
When the creature isn’t on its home plane, it gains the extraplanar subtype

Fiendish creatures are natives of one of the evil-aligned Outer Planes.

Source

Alien Archive pg. 151

This website uses trademarks and/or copyrights owned by Paizo Inc., which are used under Paizo's Community Use Policy. We are expressly prohibited from charging you to use or access this content. This website is not published, endorsed, or specifically approved by Paizo Inc. For more information about Paizo's Community Use Policy, please visit paizo.com/communityuse. For more information about Paizo Inc. and Paizo products, please visit paizo.com.