[@SimpleWriter]

Backlash huh. Hmm. Could I do something like reinforcing an object only delays the damage it would sustain? That way after it wears off in a minute the normal damage comes back, could end up destroying whatever he's reinforcing so he has to be mindful not to over use it. Not really a direct drawback but it'll at least prevent Damian from just using his quirk over and over on an object since he will end up destroying it.

Another idea is that the more he uses his powers his body takes physical strain depending on how he's reinforcing his items. Harder objects causes bruises, sharper objects gives him cuts, etc.