Metal: Hellsinger

Acheron is the seventh Hell, the second last level of the game. The new “mechanic” for this level is that you aren’t able to use Paz due to story reasons, though unless you’re very specifically trying for high score this basically won’t matter. This level also has some very long combat encounters, so be aware of that in some locations like the small tunnel midway through the level, you’re actually stuck in there for quite a while.
The boss in this level is easily the most mechanic-heavy of all of the Aspect bosses, pulling attacks from most others, while also being in an arena where the floor is always moving because you’re standing on three large gears. When you go in keep in mind that all of the Health Crystals are on the wall that you enter through, so you need to get back there to grab health. During normal phases the boss shoots the typical homing orbs at you, so you always want to keep moving around then. When you get through a damage phase watch out for when the boss throws a number of mines all over the arena because they stick around for a while and damage you. You can normally move to one of the other three gears that will be more clear of mines than the other two.