This heavy vial appears to be filled with solid black metal, but when upended, the blackness flows slowly downward.

An elixir of adamantine blood causes a reaction that hardens your flesh. You gain 10 temporary hit points, which last for up to 1 hour. These temporary hit points do not stack with any other effects that grant temporary hit points.
If you wear adamantine armor when you drink this elixir, you instead gain 20 temporary hit points (though if you remove the armor before the duration elapses, you lose 10 of the temporary hit points immediately).

Prerequisites: Craft Wondrous Item, stoneskin.
Cost to Create: 250 gp, 20 XP, 1 day.