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Continue to ChatPolymorph, If you are brought below 0 hp by fire, but your new form is immune to fire... https://www.sageadvice.eu/polymorph-if-you-are-brought-below-0-hp-by-fire-but-your-new-form-is-immune-to-fire/
Polymorph, If you are brought below 0 hp by fire, but your new form is immune to fire... https://www.sageadvice.eu/polymorph-if-you-are-brought-below-0-hp-by-fire-but-your-new-form-is-immune-to-fire/