"[1] Although there are "as many demons as the sins that man commits" and Bushyasta is among the few daevas who are specifically mentioned in the texts, she is not among the fiends who are described in any great detail.
In verse 1 and 2 of Yasht 18, which is nominally dedicated to Arshtat "Justice", khwarenah is said to vanquish Angra Mainyu, Aeshma of "Wrath", the Freezing Cold, Apaosha of "Drought", and Bushyasta.
[3] Towards dawn, before the demons are forced back into the darkness, Bushyasta rushes from the north murmuring "Sleep on, O men!
In a fragment of the "lesser" Bundahishn, Bushasp brings an "unnatural lethargy" upon a hero, who then at that moment fails to defend the world against the fiendish deeds of Aži Dahaka.
In the Dadestan-i Denig 37.44, Bushasp is one of the few explicitly named entities amongst the "hordes" of demons created by Ahriman (Angra Mainyu).