Weirdo
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Versatile Weapon is a spell that lets a weapon or ammunition bypass DR/slashing (or bludgeoning, piercing, cold iron, or silver, chosen when you cast the spell). It also gives the weapon an enhancement bonus for a short time though that may or may not be relevant depending on whether your weapon already has such a bonus.
| StreamOfTheSky |
If 3E material is allowed, Races of the Wild had serpentstongue arrows that did piercing and slashing damage; same range, damage, and weight. Only cost 3 gp for a quiver of 20. They also did full damage (rather than half, as normal for projectiles) to objects that had hardness 5 or less. Not sure if PF still has that rule, though.