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Ursa making poison

Ursa made the poison for Ozai before leaving.

Ursa's poison is a mixture created by Ursa for Ozai, who used it to murder his father and take the throne, in exchange for Zuko's life.[1]


Ursa's mother, Rina, was a master herbalist and taught her daughter how to concoct a deadly poison at some point before Ursa's departure from Hira'a.

When Ursa learned that Azulon had ordered Ozai to take Zuko's life, she struck a bargain with him: she would give him a poison that was completely untraceable to do as he wished with it, and in return, he would spare Zuko's life. Ozai agreed to the deal, but only if Ursa promised to leave the Fire Nation Capital and never return, fearing that she would use it on him as well. After making the poison, she handed it to Ozai and left without saying a word to him. The next day, Azulon was dead, and Ozai became the new Fire Lord.[1]


The poison is a colorless and odorless solution made by heating a combination of herbs. Individuals who ingest the poison die what appears as a natural death, given that it does not elicit any symptoms.[1]


  1. 1.0 1.1 1.2 1.3 DiMartino, Michael Dante; Konietzko, Bryan; Yang, Gene Luen (writer), Sasaki of Gurihiru (penciling, inking), Kawano of Gurihiru (colorist), Heisler, Michael; Comicraft (letterer). The Search Part Two (July 10, 2013), Dark Horse Comics.