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One of my player wants to buy a cold iron longsword and then have it coated with silver. His goal is to have one weapon that will fulfill both cold iron and silver DR requirements with one weapon without having to use weapon blanching.
My question is: Will this weapon bypass fey creatures DR 5/cold iron or would the silver inhibit the cold iron by preventing it from coming into contact with the flesh of the fey creature?

Roberta Yang |

Even if it's not allowed in RAW, it doesn't sound game-breaking (especially since everyone gets this once they get to +3 weapons, and anyone could presumably do this with making each end of a double-weapon out of different materials), so you could easily house-rule that only one half of the longsword is coated with silver. When using it normally, determine at random (1d2) which blade hits the target; when trying to hit with a specific blade, impose some minor penalty on the attack roll, but that material will be the one that connects if the attack hits.

Fredrik |

I agree with Gauss. I recommend an alchemical silver dagger in a spring-loaded wrist sheath; this will also allow him to sneak a weapon past security, bypass DR/piercing, and strike at something underwater without penalty.
If he can afford it, then I would suggest a mithral dagger instead (due to the alchemical silver dagger's damage penalty). Keep in mind that since it weighs half as much as a normal dagger, it would only cost 252 gp; how that works with including the masterwork price... I don't know.
The alchemical silvering process can’t be applied to nonmetal items, and it doesn’t work on rare metals such as adamantine, cold iron, and mithral.

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One of my player wants to buy a cold iron longsword and then have it coated with silver. His goal is to have one weapon that will fulfill both cold iron and silver DR requirements with one weapon without having to use weapon blanching.
My question is: Will this weapon bypass fey creatures DR 5/cold iron or would the silver inhibit the cold iron by preventing it from coming into contact with the flesh of the fey creature?
Depending on character level and wealth, you could have the cold iron longsword and have a vial of silversheen. It would convert the cold iron longsword into silver for 1 hour.
They could also get a weapon with a +3 enhancement bonus. Since a +3 weapon is treated as cold iron or silver for the purpose of overcoming DR. Just remember that it would have to be an actual +3 weapon and not an equivalent such as a +1 flaming burst.

Fredrik |

You know, I just checked and Hero Lab prices a mithral dagger at 502 gp. They're not infallible; but at the same time, I'm sure that they don't hear the end of it if there's a dev post somewhere that they didn't take into account. Maybe the per-pound price is supposed to be in terms of the non-mithral weight? It wouldn't make much sense -- but then neither does having it cost less than masterpiece.

Fredrik |

You know, I've come down on the other side of this question now due to the mithral cookware in Ultimate Equipment being priced according to the mithral weight, not the steel weight. Without a link for an authoritative post saying otherwise, that's what I'm going with for "other items" (non-armor non-shields) in PFS. So yeah, a 252 gp mithral (and therefore masterwork) dagger.

Ashram |

Since it's basically the surface layer of material that counts when determining what DR you can bypass, if you coat an iron sword with silver then it can't get through DR/cold iron anymore, until you scrape off the silver.
The silversheen seems like a nice fix though. Or just the general +3 sword.
This, if anything. Also, a cold iron weapon coated in alchemical silver would still cost the extra 2,000 gp to enhance (Because the base material is still cold iron) AND it would take the penalty to damage.