Sienna (Harpy)

Sienna was a Harpy who was sent after the Destined Ones by Gadreel. She had specific instrustions to kill anyone she wanted except Prue and Wyatt, as Gadreel wanted them for himself. She also made the mistake of calling Gadreel "lord", but came up with the idea of calling him, "majesty" instead.

She attacked the Halliwells twice, and both times managed to avoid hurting Prue. However, she ended up hurting Prue and her mistake lead to her being vanquished by the Charmed Ones. Gadreel resurrected her to scold her, and then vanquished her again to punish her for harming Prue.