Item from Re:Zero by Tappei Nagatsuki
The blood of Volcanica, the Divine Dragon — a substance that heals almost anything and is so rare that wars have been fought over single vials.
Dragon Blood is the blood of Volcanica, the Divine Dragon who formed a covenant with the Kingdom of Lugunica and whose protection has kept the nation stable for four centuries. The blood possesses extraordinary healing properties — capable of curing diseases, regenerating wounds, and restoring what other magic cannot. It is, by any measure, the most valuable substance in the world. The covenant between Volcanica and Lugunica is the reason the kingdom has survived as long as it has, and Dragon Blood is the physical manifestation of that relationship. Its extreme rarity makes it a political resource as much as a medical one — possessing Dragon Blood means possessing leverage. The substance has been sought to cure Rem's memory-eaten state, to heal Crusch's Authority-inflicted amnesia, and to address other wounds that conventional healing magic cannot touch. Whether the Dragon will provide more is a question that depends on whether Volcanica — ancient, possibly senile, and bound by a covenant he may no longer fully understand — chooses to honor a promise made to a kingdom that has changed beyond recognition.
Also known as: Dragon Blood, Volcanica's Blood, Blood of the Dragon