I'm really interested in this item but I can't understand how does it work. I can't put it in the quick slot, because it says that "item has no usable ability". I looked through its scripts and then at B!STONE item in NI. I can't quite figure out how it should work. It's a misc type so I can't use, it's just an orange stone which I bought at Ribald's...

Also I'm at the 3d chapter so I satisfy some script conditions. Could anyone explain me how does it suppose to work. Thanks in advance.
RYUchan