This one isn't due to a power outage but because not using guides I didn't know this was going to happen. But on Parasite Eve you get to name one weapon and one armor at the end of the game. Now whenever you finish the game, everything in your inventory plus that weapon and armor are in the box when you restart. Now, I just assumed that it allows you to rename two pieces of equipment but everything gets thrown in your box regardless, what I didn't realize is that it only carries over what was in your box, not what was on hand at the time unless it was renamed that game. So my two pieces of equipment(which have already been renamed) I decided to rename two other pieces of equipment and then used these ones during the last boss.

I lost a pistol that only shot one bullet per action(so no reduced damage because multiple shots,) it allowed my character to take three actions per turn, had all the stat up effects, it also used shotgun shells so it had spreadshot to deal damage to other nearby enemies, and had explosive damage. This pistol was essentially a rocket launcher in handgun form and it was from all the guns from four different playthroughs into one powerful super gun.

Despite already being renamed, the weapon was not carried over because it was in my possession, not in the box when I killed the last boss on that playthrough and it was not renamed on that specific playthrough which doesn't count towards what will carry over.