So, I'm not sure if it's a glitch or an easter egg, but after beating Decem I got a monocaster. I unequipped my two autocasters, and put on an old monocaster plus the new one...and then things got out of hand.
It will literally burn through everything and make it explode. I can kill Decem in 4 seconds if I juggle him long enough to keep his shield from blocking everything. I've closed my game, opened it back up and still have the same result, so I think it's item related.
The bug should be fixed, however, I initially thought someone was using a turbo controller or something when I heard about the bug.
Can you explain how you got this to happen? My fix limits the Monocaster to a single shot every tenth of a second, which fixes THIS issue - but I want to make sure there are no input issues hiding behind this.
Actually had this happen to me too. First time it happened was when I hopped onto practice mode with monocaster equipped, it just started working. The next few times I tried to recreate it. My process was to equip two autocasters, exit out of menu to make sure they were working correctly, then going back in and switching one out for the monocaster. Out of 5 attempts, this worked 3 times. It would stop working if I switched out the remaining autocaster for the nano-spear, didn't try any other items.