Non-lethal form

"Now then, we'll start the mock battle. Both sides, materialize your Device in illusionary form."

"Come forth, Intetsu."

"Serve me, Lævateinn."

Stella summoned Lævateinn, the sword shaped from her soul, into a form that deals no physical damage to humans but cleaves away physical stamina and strength directly. And she vowed to the boy in front of her―she'd crush him.