Ultimate ninja storm 3 help

[LUMOS ULTIMATUM]

Please help me. What are substitution items? What do they do? When you equip your character with it, what happens? I tried once but nothing happened. Could it be that I equipped the wrong character?

 

[The Necromancer]

Don't they just change what item appears in the puff of smoke when you use your subs? I'm not sure.

 

[Kαmi]

Don't they just change what item appears in the puff of smoke when you use your subs? I'm not sure.

That's exactly what they are, here's your answer OP