Please don't over-categorize!
For example a page for a particular sword belongs only in the 'swords' category, not also in the 'weapons' category. Put the 'slicer' category itself in the 'weapons' category.
Also remember to be game-specific. There shouldn't even be a 'swords' category, only 'Phantasy Star Universe Swords', 'Phantasy Star Online 2 Swords' etc.