She needs to collect the skull.
The Skull Merchant's mori is, visually, the most underwhelming by far. She's literally just stabbing them, and if you put it in the context of a horror movie, anyone watching would just say "meh."
I don't care how she does it, but she is The Skull Merchant, and she needs to collect that skull as part of her mori.
Comments
Should have her mori have her place a helmet on the Survivor, and the helmet slowly forms into one of her Skull Drones, as if she made some device to streamline the process of drone creation.