Archdrake Priestess | Dark Souls 2 Wiki

Edit Hollowed priestesses formerly responsible for performing the sealing rituals which imprisoned the Demon of Song.
Over time the line of shrine maidens gradually died off and, with no successors to pass down the sacred rites, the seal broke and Demon was freed from its prison.

These female sorcerers cast Homing Soul Arrow at you. They have an extremely large aggro range and the spell will track you over large distances. They are able to lock onto and attack you from maximum view range with powerful, fast, homing soul arrows. In melee combat they use their staffs in wide sweeps in front of them. Note: Since patch 1.03, the homing soul arrows don't home in as they used to (now you just need to move left or right) and do slightly less damage.

Note: An interesting variant is a healer Priestess who heals everyone around her when she is hurt or her allies are damaged. Has no offensive attacks or spells. Only one appears in NG, just before Rhoy's Resting Place bonfire (3rd bonfire), hiding behind the two Archdrake Pilgrims at the cave entrance. More come out in NG+.