Board Thread:Chapter Discourse/@comment-44056425-20191203182120/@comment-44056425-20191224080700

Mahiru before her death on Catastrophe at 16 novel 7 last chapter mentioned that to activate Seraph the sword that should be use needs a progenitor's blood too and then Guren asked her that if she is a progenitor too and then that time it was proved that Mahiru was a progenitor so she actually gave her own blood in order that Guren can use the Seraph for reviving and according to the fanbook Mika along with Rene and Lacus is not a progenitor.

Go and read Catastrophe again more carefully