Archvenom

For the duration, your body becomes a supreme toxin engine. Your Poison Secretion powers ignore poison resistance and treat poison immunity as resistance unless the target is divine, Artifact-grade, undead, construct, or story-protected. Once per turn when you deal poison damage, add 2d10 poison damage or impose disadvantage on the target’s next CON save before your next turn.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.