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What effect does my 2nd level Magus' +1 enhancement from his Arcane Pool have on overcoming DR? I read through this earlier thread, but it left more questions unanswered than answered for me. The last PFS adventure I played in, the GM ruled that my PC's arcane pool bonus had no effect on overcoming DR on a monster that had DR 5/Cold, but I'm wondering if that was correct?

Xaratherus |

Magical enhancements to a weapon don't overcome DR/Cold, but overcome specific types of DR depending on the amount of enhancement. A +1 weapon will overcome DR/Magic; a +3 weapon will overcome DR/Cold Iron, Silver; a +4 will overcome DR/Adamantine; +5 will over DR/Alignment*.
In order to overcome DR/Cold you'd need a weapon or effect that specifically deals cold damage. At 5th level a Magus could put the Frost enhancement on his weapon, but even that won't overcome DR/Cold for the weapon damage - the extra d6 of cold damage would overcome the DR though.
*Each level also overcomes the DR of any lower weapon, of course - so a +5 weapon overcomes DR/Magic, DR/Cold Iron, DR/Silver, DR/Adamantine, and DR/Alignment.

Xaratherus |

Yep. The number preceding the slash determines the amount of damage negated from an attack that cannot bypass the DR type (proceeding the slash); as long as you match the DR type though, you bypass it completely. So a character could hypothetically have DR 9001/magic, and it won't do anything against damage from a +1 dagger.
Note that DR also only applies to 'physical' damage - primarily weapon damage. Spells, SLAs, supernatural effects, and energy damage (magical or mundane) generally will bypass DR. So the creature you mention, with DR 5/cold would still take full damage from, say, a Fireball.

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There is a line in the Arcane Pool description that states:
"...These bonuses can be added to the weapon, stacking with existing weapon enhancement to a maximum of +5..."
So if you had a +2 weapon and activated your +1 from your arcane pool then it stacks with the +2 essentially making it a +3 weapon...which would indeed bypass silver and cold iron DR.

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Greater magic weapon specifically excludes its enhancement bonus from penetrating DR; there is a lack of similar language in Arcane Pool. This implies that raising your weapon to +3 or higher does indeed penetrate DR per the normal way.
Arcane Pool also has a much shorter duration than the spell.