Reading the bestiary

[Chaubin]

Greetings, I am a relatively new game master and I could use some advice reading the bestiary. I got most of it down, but the fiddly bits are interesting.
Right now, i'm prepping some Mephits for a session coming up, and they have DR/Magic. I can't seem to find out if that means they are resistant to magic or resistant to everything, except magic.

Thanks for any help.

[DM_Darkmoon]

It means that magic weapons get past their DR and do normal damage.

[StabbittyDoom]

DR is short for "Damage Reduction". They resist the first X points of physical damage from every attack (in this case 5). The part after the / is what kind of attack ignores their damage reduction. In this case, attacks made via magic or magical weapons ignore their damage reduction. Non-physical attacks always ignore DR because DR only resists physical damage.

DR/magic also has an interesting side effect: Creatures that possess natural DR/magic also treat their natural attacks as magical, meaning they can bypass the DR/magic of other creatures with their claws, bites, etc.

EDIT: To be clear, anything that deals bludgeoning, slashing, or piercing damage is a physical attack. Anything that does not deal one of those types is not.

http://www.d20pfsrd.com/bestiary/rules-for-monsters/universal-monster-rules #TOC-Damage-Reduction-Ex-or-Su-

[Chaubin]

Thanks guys! I really appreciate how quickly and thoroughly the people here answer these questions. You guys rock!