Nice catch, I think the monochrome effect always draws the player regardless of if they're invisible or not. It might be depth sorted on top of the explosions too.
The explosions are very strong so they're balanced out by having a finite number of uses before you damage yourself enough to lose the powerup. I think them spawning is a holdover from DDG1 (the arena code might be reused with no changes) but I cut them from the main game since bringing one to a boss fight would risk making it unwinnable.
I might have mixed up some Reaper's Castle and Caldera Keep settings, I'll need to look into this.



