User blog comment:B214/Volume 22 spoilers/@comment-3965848-20161204121455/@comment-2.220.205.251-20161204224620

the Hebrew meaning of Ravel foreshadowed her being  in Isseis harem and his peerge. Ravel is a variation of Raphael which means "God is Healing" or "Healing One of God".. Issei is 'one of god' because he was reborn from two gods and wields the power of one. These have 2 connections. The 1st being Ravel giving a Pheonix Tear to Issei in Volume 5 IIRC if not then its Volume 7 as a gift because she likes him, where it was used to heal him from Fenrirs wound. If not for Ravel he would have died. Also she 'heals' him of negativity as a haramette. The 2nd connection is actually about her true potential. A Bishop is the healer of the peerage and the Pheonix has very powerful healing properties; this was turned into the Pheonix Tears. So what Raveld true potential is, is being a hax healer and offense so she is healing her 'god' Issei.