[quote=@Ryteb Pymeroce]
It's mostly minor things. His attacks will become more cartoony, bombs will become acme style, laugh tracks. Oh, and Wrath will be crushed by an anvil from time to time

Wrath: Why me?

Don't blame me, blame your shitty Luck stat

Wrath: Didn't you design my stats?

...nooo?
[/quote]

If it has direct interaction with the world (like people can hold the bombs you created, or can inflict them damage with it, or use weapons you temporarily summon), I'm afraid this would cause a conflict with how other skills work. If he can summon weapons/materials from the real world (even temporary), that would clash with Ren's Online Shop. Also summoning weapons kinda makes Weapon Copy skill just a higher tier skill but not unique. 

A remedy I can think of is illusion magic (with no physical substance), or Static Ice-Make since you already have the skill. It's like Gray Fullbuster's where he can make inanimate objects out of his ice magic.