Eren was a male wildcat member of the Gingivera Clan. He was the son of Ela, and the cousin of Alister and Ruthie. Offended that his mother selected Alister as her heir instead of himself, Eren wanted to spark a war between his clan and Redwall Abbey, hoping Alister would fail as a leader and he could takeover instead. In the process, he murdered Sister Mary-Lo at the Abbey.