It's a Prison.

Strax left the room without saying another word, his expression still heavy with something dark. The new sword weighed in his hand, not because of its physical weight, but because of the overwhelming presence of the souls trapped within it. He didn't hesitate, walking straight to Scarlet, the one he knew was most capable of dealing with this.

Upon meeting her, he handed her the blade without ceremony.

"Destroy this. Now." His voice was firm, but devoid of emotion, as though he were trying to rid himself of something that disgusted him.

Scarlet raised an eyebrow, carefully taking the sword. As soon as her fingers touched the hilt, her eyes widened slightly. A surge of powerful energy coursed through her body, and she felt each of the presences sealed within it.