I am fairly confident you want to use different wording than "slice through everything" at the very least. From the top of my head, I am fairly certain slicing through one of the acid shells discussed earlier for example would melt the sword in half. My character uses a solidified shadow for weapon, we could bash heads endlessly about which would be the one getting sliced using much of pseudo physics and hate each others guts for all eternity. All I ask is a bit more detailed explanation.