Reason: It crashes Minecraft on use, tested it with another player and they crashed too, (I Think they never logged back on)
Just tested it and it crashed for me too but I can just rejoin the server without crashing again. So I would leave it for now.
You can rejoin and use the book without crashing? For me it closes minecraft which takes a good 5 minutes to relaunch SF3
Did you ever test this in single player @_sporefreak_ ? We might put a tooltip warning for the item but banning it isn't really the answer. Do you have a crash-report so we can report it to the developers?
Didn't crash in single player, the Devs already know about the bug. Some people reporting it in single player games too. (Friend DID crash in single player)
I really can't support banning this item at this time. This is on the Mod Devs to fix. Seems to me it only crashes people some of the time from what I have gathered.