Understanding resists (or, how do curses work?)

[MKula]

So here's a drop I just got. It's fairly unremarkable except for the fire/cold weirdness going on:

> Studded Leather Armour of Resist Cold (-1) [12, +6] {cursed}
> Found lying on the floor at 800 feet (level 16)
>
> A cuirass of pliable leather studded with metal rivets.
>
>It makes you vulnerable to cold attacks, but resistant to fire.
>It makes you hallucinate sometimes.
>It occasionally makes a loud noise.
>Provides resistance to cold.
>Can be destroyed by acid, fire.

In this case do the cold resist + curse cancel each other, thus in fact making this an armour of resist fire?

[Nick]

Yes, this kind of makes it armour of resist fire - but it also means that other equipment with RCold will be ineffective.

The way the calculation works is that resists and vulnerabilities are all noted, and then resist + vulnerability = nothing. If you then drink a !RCold, you will have single resist, but there's no way to get double RCold while you have that curse.

[fph]

Interesting that (non-temporary) resistances and vulnerabilities stack exactly like advantage and disadvantage in DnD 5E, even if I believe the mechanics were created independently.

[Sky]

While Nick is here, he could answer another curse-related question: which curses increase a weapon's value??
Do dragon/undead summons increase the weapon's value?

[Nick]

While Nick is here, he could answer another curse-related question: which curses increase a weapon's value??
Do dragon/undead summons increase the weapon's value?

No, currently curses just take off a flat amount according to their power.