Butterfly sword poisoning

[Vexel star]

If I were to poison the butterfly sword while they're together and then separate them will both blades be poisoned. me and my GM decided that the effectiveness of the poison would be reduced so we reduced the DC by two and the damaged die we stepped down by 1 so a D3 will be reduced to a D2 to a minimum of one

[blahpers]

While they're together, they're still two weapons. You'd either be applying poison to one of the blades or using two doses to apply to both of the blades. There are no rules for applying half a dose of poison to a single weapon, so it's up to GM fiat at that point.

[Galnörag]

Looking at how poison scales, if you are hit with a second dose while poisened, you increase the DC by 2 and the duration by 50% of the original duration.

So getting half a dose I might scale the other -2 to the DC, and reduce the duration by 50%.. Anything less then half a does doesn’t work.

Now... poison is broken with respect to dosage, because it doesn’t take into account the creatures size. Two CR 10 monsters might have similar fort saves, but one might be huge and the other tiny, the tiny creature could bath in the poison, the huge creature might not notice it, and yet the effect and save is the same.

So given how broken the model for poison is, the adjustment your GM made is probably good enoug.