[quote=@hatakekuro]
<Snipped quote by Vongola_Hasayo>

He's a maker mage, it should be expected that he is well versed in many weapons. Besides, most of the weapons are just advanced variations of the basic forms of his weapons. I mean look at Gray, he uses many forms of weapons made of ice. 
[/quote]

Maybe just combine some of them that use the same general template? Like folding the sword, the rapier, the twin swords, and the big sword, into one spell that just makes swords, but he can alter their size and shape depending on the type of bones used? Maybe in-character give them their different names, but the actual spell is just a general-purpose creation of sword type weapons?