The seed suddenly grew into a thorny vine that would wrap around Bernkastel and drain the Witch clean of magic energy. The world around them began to fall apart, and Takahisa was freed from the pain he was in, the blade in him disappearing.
----
"An artifact. It's called a Spirit Fossil, and it's usually used to purge very very dangerous curses. Like possession or corruption," Kaika says with what she knew about it.