The last is where you'll see a static energy thing, which will turn into orbs that hurt you (there's 3). Another attack is where the orb charges up and shoots a beam of energy at you. The first one involves a bunch of black columns on the screen, this will turn into a big pillar of dark energy that hurts you, just get out of it's range. The orb in the background is the boss, lock onto it to hit it reliably. You can only stand on the floating platforms, and they disappear from time to time. Following the path you'll run into a pretty annoying mini-boss. When the Dullahan got close I'd run to the other side of the arena. When the Dullahan's missiles come toward you, use melee to get rid of them. I would generally sit at one edge of the arena and spam Magic Beam. You'll have to face a Dullahan who loves spamming his ranged attack along with a lot of Dark Memories and Dark Memory Archers. Head east to find a Magic Soul, and find some enemies. It doesn't change the game much, just a lot more jumping than usual. This area occurs in a 2d plane, there's 1 or 2 other areas like this in the 4th wing. At the end you'll find a door to the next area. Now follow the path up, using the block to jump across the gap. Once he's dead follow the path to the bottom and hit the switch, a block will appear you can use to get back up. He only has one ranged attack, where he summons 2 orbs and throws them at you, but he didn't seem to use it much. I just stayed far away from him and used Magic Beam. However if you're far enough away he won't dash at you until he closes the distance. He dashes at you to melee, and then he usually follows with a second swing after dashing at you again, so it's pretty annoying to deal with. He doesn't take much damage from magic but that's how I chose to fight him anyway because he's incredibly annoying in melee range. Now jump off the edge and land on the platform below you.

Backtrack until you see him again, talk to him. Follow the path until you reach a gap, try to jump across and you'll drop, the Zero mask will appear, talk to him. By the first one you'll see some pots and the purple flame of an item. Now head up to the 2nd floor and go to 4th wing, which is the south door on the 2nd floor. No map for this, this area is multilevel and the map only shows the basic outline of the place, so it's not very helpful.

Anima gate of memories walkthrough