Eight Blades of the Bishop
Found in the Bishop's Lockup in Season_Five#2021-11-08 they are a series of daggers with maybe spirits in them. There are also a couple of blades that feel "weird/wrong and silvery".
These are examined in Season_Six#2022-05-16 by Holly who suspects they are a gateway to a place rather than carrying a spirit within. Lydia prayed for understanding of one of them and possibly channels Archangel Michael.
Currently in possession of The Southwark Belles