Requiem - Requiem is Arya's weapon of choice. Requiem has two modes: greatstaff and tonfa.
Due to Arya's preference for Lightning dust, the centermost part of the staff as well as the handles of the tonfas have rubber grips so Arya doesn't electrocute herself.
Purification - Using her Aura, Arya is able to influence another person's aura so that their negative feelings disappear, and the person forgets why they're feeling negative. However, there are a lot of strings attached, per se, for whether Arya is actually able to purify the negative emotion.