Damage Interaction Question.

[kmdietri]

Tonight in our session we fought a Larva Mage.

It has "takes half damage from melee and ranged attacks; Vulnerable 10 radiant,"

We had a melee attack which did +1d6 radiant damage thanks to Weapon of the Gods.

Should I have added the 10 vulnerable before I halved the damage or after I halved it?

 

[Surgoshan]

After.

Vulnerable means you take additional damage. So you take the damage from the attack (which is halved) then you take the additional damage from your vulnerability.

 

[Underage AOLer]

I seem to recall that if something has overlapping vulnerabilities and resistances, only the vulnerability would apply... but I can't find the reference. I'll let you know when/if I do.

Edit: I was wrong. Page 176 of the DMG has a blurb on overlapping abilities, and I guess I didn't remember it right. Listen to Surgoshan.

 

[Mouseferatu]

No, that just refers to whether the vulnerability still exists, not to the order you apply them.

In the case of a "half damage" effect plus a vulnerability, you add the extra vulnerability damage to the base damage, and then divide the whole thing by half.

So in the case of the OP, you'd roll 1d6+10, then halve the whole thing.

 

[kmdietri]

No, that just refers to whether the vulnerability still exists, not to the order you apply them.

In the case of a "half damage" effect plus a vulnerability, you add the extra vulnerability damage to the base damage, and then divine the whole thing by half.

So in the case of the OP, you'd roll 1d6+10, then halve the whole thing.

Sweet, that's how I ruled it.

Thanks Mouseferatu