Board Thread:General Discussion/@comment-31283382-20131101162239/@comment-4957813-20131104012558

An Arrancar is any Hollow of any sort, normal, Adjuchas, etc. to have had their mask broken in some way or form. Through that, they gain additional power. Vasto Lorde is the highest class of Menos gained by an Adjuchas eating and eating an unspecified number of Hollows. There has been no elaboration in how complete an Arrancar is besides how powerful they are. In general, the more human the Arrancar appears, the stronger they are.