Mystic Ark/The Final Battle

The door to the Nexus of Darkness
Go back to the room where the game started. Examine the crystals between the two statues. Use the Ark of Darkness, and the crystal will break and reveal the door.

The Nexus of Darkness
This world is made of a single dungeon.

First part
Narrow paths over a dark abyss. Turn right at the first fork, then continue until you see the sub-boss, but do not fight it yet. Instead, walk to the south-east until you find a chest with a forbidden symbol.

BOSS: Iron Claw
Like most bosses, he has strong magic resistance.

Second part
After you defeat Iron Claw, you will face a maze. You start in a room with four doors to the north. Apparently, they all connect to the same area. In fact, there are invisible walls that force you to turn sideways at every fork. It is a principle similar to the first boss fight in Mega Man X1. The second door from the right is the one that allows you to get past the maze, the other three lead to single chests containing a mana jar, a magic mirror and a special herb.

Once you get past the maze, you will soon see a switch next to a door. If you activate it, a shortcut will open. Thanks to this, you can easily go back to the shrine island, where you can save your game and rest at any inn. Indeed, there are neither save points nor inns in the Nexus of Darkness.

After you rest and and save, come back to the nexus, use the shortcut and continue to the next area. It is actually free from enemies. The following room, instead, has enemies, but it short enough and you could be able to avoid them. This pitch black area is actually just a straight, narrow corridor. At the opposite exit, you will meet the second boss.

BOSS: Naga Raja
Remove the Ark of Darkness from any staff: it has no effect on these last two bosses. The Naga Raja is resistant against magic.

FINAL BOSS: Malice
Malice is resistant against magic. It has an insane amount of health points. Use as many support spells as you can on your party members, then set them on "auto" battle mode, and let them fight. After a quite long while, Malice will be defeated.

Aftermath
In the ending you hear the cries of a newborn baby: Lemele or Fellis is born! Because of the other noises, you can suppose it is probably a world different from the one of The 7th Saga or Brain Lord. Maybe this is a further incarnation of the heroes? Only an English translation of Mystic Ark: Maboroshi Gekijou will tell.