Rozia is an Enemy Sorcerer encountered in the Avalon Pact I. Innocence "Fellow in the Forest". He is a "Contractor", a Sorcerer that specializes in killing Sorcerers that repeatedly violate the Code of Avalon by saving Archfiends instead of sacrificing them.
Rozia's primary attack is a charged Homing spell. As he is the first Enemy Sorcerer you are likely to encounter, he is fairly easy to defeat.