Hello, could anyone help with this sentence?
I'm lost. It's most likely a reference but I don't get it.
The context is the following:
They're talking in a novel about how magic is needed to kill a ghost, but then how a warrior whose can't use magic would have a hard time to kill one.

Wizと同じと思えばいい、幽○か－にしとけ武器は×だと通らないから。

@NSXG Hey Hime, how are you?
Do you know of this manga?
I have some questions to ask you if you're free.

http://ichiba.nicovideo.jp/item/az4088060083?utm_campaign=a_%E3%82%B9%E3%83%A9%E3%82%A4%E3%83%A0%E5%86%92%E9%99%BA%E8%A8%98&utm_medium=nicodic&utm_source=nicovideo.jp&utm_content=thumbnail