Eevo is split-ergative, with imperfective tenses using accusative morphosyntax and perfective tenses using ergative morphosyntax. The ergative preposition is ''rw''.
It's conflated with the possessive pronouns in some dialects, where it is used even outside ergative tenses to mark an ergative subject in clauses with fronting, and the possessive pronouns are also used ergatively. Some even argue that ''a(ð)'' is on its way to becoming an absolutive case marker.