The vampire has DR/magic and silver. I tried to research this a little, and I think Sandru is right (and my tabletop group has played this incorrectly forever, lol...) The magic enhancement on the cutlass is not enough to overcome the silver part of the DR.
In other words, I think if the vampire had only DR/magic, the cutlass's +1 would bypass it. But the vampires have the option of choosing their better DR, which in this case is silver. In which case, Sandru would need at least +3 on the weapon to bypass (or be silver).
Which means that Quinn's attack inflicted 60 (instead of 65), because of the silver DR, and Sandru's attack would inflict 9 damage.
As for Quinn's damage, if it's against the vampire lord, and the lord is like THIS guy, then I would think that each of Quinn's arrows inflict ten (OUCH!) less damage, so it would be something like 25 instead of 65. I hope I'm wrong (happens ALL the time), but I don't think so.
Next turn, if he shoots silver arrows with that magic bow, all that DR ain't nothing.
Also, if I imbue my mwk pistol with the bane special ability, I'm not sure if that counts for DR. Otherwise, I could fire a silver+bane bullet each round.
As for Quinn's damage, if it's against the vampire lord, and the lord is like THIS guy, then I would think that each of Quinn's arrows inflict ten (OUCH!) less damage, so it would be something like 25 instead of 65. I hope I'm wrong (happens ALL the time), but I don't think so.
You are wrong. Quinn has Clustered Shot, that adds all those attacks together before counting DR.
@Sandru - The henchmen are less powerful underlings than the leader guy, but not vampire spawn as per the stat block. I'm using sort of a modified in-between.
HP 60/97 Male Half-Orc Barbarian 1/Unbreakable 2/Rogue 6
Cool, I only meant that I was not considering "magic and silver", just "silver".
You are a quite fair if not generous GM... and we're pretty crafty, no many times it feels like we slice through what may have been meant to be a tougher challenge.
Hah! When I summon a creature mainly to disrupt and be in the way and be immune to mind-affecting, I roll d20's that would, for my Void Creature, have been a confirmed crit for 8d6+32. I am amused.
