Renne (レン), also known as the Angel of Slaughter (殲滅天使, senmetsu tenshi), is associated with Ouroboros as Legion No. XV. Renne appeared in Sora no Kiseki SC as an enforcer of the Gospel Plan in Liberl. After completion of the plan, Estelle and Joshua Bright followed Renne to Crossbell to adopt her into their family. Renne considers her personal humanoid weapon Pater-Mater, made by the Thirteen Factories, as her true parent(s).