Ironheart Tonic

A dense grey-red liquid fills a squat glass vial, carrying tiny metallic flecks that drift through it like filings in thick oil. The tonic tastes sharply of iron and smoke, and for a few moments after swallowing it the drinker can hear their own heartbeat with startling clarity.

For 1 hour after drinking, the creature gains 6 temporary HP and +1 DR. Damage is taken from these temporary HP first. Any remaining temporary HP vanish when the effect ends.