Board Thread:Theories and Speculation/@comment-36512555-20200302063012/@comment-32685487-20200409183927

"It is sheathed in a sake jar; the blade is unlike any other — rather than a conventional form, the blade is actually the liquid inside the gourd that is released and shaped into a blade." "It is an ethereal weapon"

https://www.merriam-webster.com/dictionary/ethereal