|Sheath Celestia Demonis|
|Signature Abilities||Shadow Core|
As the leader of the other Demonis Siblings, Sheath is calm and reserved.
When Nike commenced his attack on Stalaria, Sheath gave orders to Kisara not to allow Aqua in. However, Aqua enters anyways, and Sheath attempts to stop her by cutting the power. Through the monitor, Aqua is able to see Sheath fighting off Nike, only for her to be stabbed through the chest and killed in a watery explosion.
An picture of her death scene is in Nike's fortress, next to her gem. During Aqua's duel with Nike, Sheath's Sakabato is the first weapon that Aqua uses against Nike.