125 Episode 5: Purification and New Mission

Since Blue has already confirmed that the destruction of the Skull Knuckles is close to impossible, then there is no harm in burning the bag alongside the weapon. Touching the miasma inside it would also cause danger to the person interacting with it so it's much better to get rid of it as soon as possible than letting it escape and cause decay to the world.

"Should I burn it outside the building? From my tour to this building earlier, there was no incinerator available for us to use," I suggested. 

"Nah, just go to your own room and burn it in there. Since you have good control in fire magic now after countless of using them, you are more likely an expert by it unless you are a fool that instead of burning the bag, you will instead burn the whole place down to ashes."