Long story short, I am currently creating a super OP alchemist boss with a template. For flavor more than anything i want to give him the Magma creature template, giving him the fire subtype and thus immunity to fire and vulnerability to cold. What happens if he gets the mummification discovery ? Does the cold immunity take over or do they cancel each other out or something ?
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^ What Jeff said.
Taking an extra 50% of 0 damage is still 0 damage.
Vulnerability to cold means that when you take cold damage, the damage is increased by 50%. Cold immunity means you do not take cold damage. Therefore, you take 150% of 0 damage, which is 0 damage.
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If a creature (mythic, winter witch, etc.) is able to bypass that immunity, I would probably let the vulnerability stand. It's a corner case but it seems interesting enough to follow through.
If a creature (mythic, winter witch, etc.) is able to bypass that immunity, I would probably let the vulnerability stand. It's a corner case but it seems interesting enough to follow through.
Oh absolutely. If something ignored cold immunity, then they will absolutely take additional damage from their cold vulnerability.