Ley Line Staff BUG.
“Can’t” play?
I suspect this is more difficult to change than it would seem (there are a lot of game resources that would be affected) and it’s not going to get high priority, since it doesn’t actually prevent playing — it’s an annoying visual bug, not a show stopper.
John Smith: “you should kill monsters, because killing monsters is awesome.”
There are a handful of other staffs that behave this way with the Necro staff set as well. Off the top of my head, I know from personal experience that the Dragon’s Jade staff does, and I know I’ve heard one or two others mentioned at some point (thinking maybe Final Rest).