Silver Arrowhead
(Info)
{{silarrow|size: full; margin-top: 5px; margin-right: 20px; float: left}}Instead of casting a silver bullet as a graduation to a hunter, Allison casts silver arrowheads. She realized that it was the silver bullet that almost allowed her father to kill an Oni.
Isaac figures out that the silver acts like a poison to the Oni, so the arrowhead allows the silver to stay in their bodies long enough to kill them.