After unlocking both
and
Eudaimonia Machine will once again disappear from the level select. Same as before, start a level using whichever mode you unlocked most recently, then quit out, and Eudaimonia will appear again.
Now when you go back in, you'll want to use whichever character you feel strongest with. It's final boss time. Personally I used the secret character Leda, unlocked by beating it in southern Gallo Tower, as they start with the upgraded wand. You won't be able to use any relics or arcanas, and no chests spawn during the fight so you can't evolve any weapons either.
Enter the level, walk up to the flashy statue thing, and after the text is done, the fight begins against The Directer. (yes that's how it's spelled)
The Directer will appear to the left of you and slowly move closer and farther from you. This distance is fixed so you can never actually run away from or run into it. Your targets are the relics that are spinning around the boss. Regular enemies will constantly spawn in so you can collect experience gems, and the boss will throw slow moving golden eggs at you. After dealing enough damage, the small arena will disappear and the stage will open up infinitely in all directions. Two hands appear on the right side of the screen to through golden eggs at you. Eventually, the relics will start shattering one by one, leaving the boss wide open. After enough damage phase 2 begins.
In phase 2, the hands on the right disappear, the boss replaces the relics that were surround it with skulls and eye balls, and gains new attacks. It will either shoot giant long lasting beams across the screen to box you into a smaller area, or rapid fire eyeballs that target the ground around you with small AOEs like the missiles in the Gallo Tower stage. Highly likely you've unlock a permanent revive on the power up screen, and a hand will drag a gray reaper directly onto you for an instakill that makes you use the revive, this can't be avoided. If the character you're playing starts with extra revives, this will repeat until you have none left. Once again, the things spinning around the boss will shatter and you can directly attack until phase 3 begins.
Phase 3 is pretty much the last epic push. The boss will now have blobs of coins and gems spinning around it, as you hit each they will drop lots of the respective item. All other enemies are now red reapers that drop nothing on death and may end up blocking your shots at the boss if you aren't strong enough to kill them fast. The hand will drag one more instakill reaper on top of you, but the game over screen will be a fake out. For the last time, the items spinning around the boss will eventually shatter. Finish off the directer, enjoy the light show, and you unlock the Greatest Jubilee weapon.