Talk:Omega/@comment-45751485-20200710181008/@comment-99.232.106.176-20200914194235

Echina first absorbed Ryuuzu's soul in order to then plant herself into Ryuuzu's body. Since absorbtion is one of her abilities, it's likely she also absorbed the souls of the deceased witches and then placed the contents in the orbs on her necklace.

This lends credence to why she was able to "call" the other witches forth to meet Subaru in the sanctuary. It would seem, Echidna holds all the witches of the past excluding the witch of envy.