[Yosei]

I died the first time at the very end bc I just happened to hit the wrong button when I went to use a HP. But it's actually very easy when you use scrolls- I used Vitality/Defense & +65 magic dmg scroll. Also, make sure you have a LOT of HP/SP T1 pots AND HP/SP stones from Healer npc. You will go through a lot of them on your clone and at the end.

I had forgotten to get my higher rank ice bolt and lightning bolt (I believe) before I did it, and I still did it easily when I had all the pots and scrolls.

I recommend taking the skeletons on 1v1, don't aggro a bunch at once.
1) at the last room, kill the big fat guard guy that comes at you from behind first (he's very easy)
2) Kill the Marlone guy 2nd
3) Kill the archer girl 3rd
4)Kill your clone (another guard will come out during the fight, don't panic, they die SO easily, it's not hard, just remember to HP/SP)

so much easier than the fiesta wikki makes it seem.

You could kill the archer and the fighter while in the dark room, just keep running forward til you see the archer pop up, kill him, then run to your right, and the fighter will pop up.