I walked through the story line yesterday and tried the boss fight in both story mode and normal mode.
Entry level is 140 and it feels easy to fight. Kind of disappointed.
Obviously, the boss has several phases:
The first phase is town battle, you attack the boss but need to avoid falling from the stage. You can move to the next stage at any time you want.
Second phase, chased by Julieta, you have to climb to the top of the castle.
Third phase, you are at the top of the castle, try to kill the boss. You can move to the next stage by jump down to the portal.
The third phase, you are at the gate of the castle, try to kill the boss too.
The fifth stage, you are fighting with other NPCs on the snow field.
In any of the stage except stage 2, if you kill the boss, you win. I usually finish the battle at the 4th stage.
I like the event chair, It looks awesome. BGM changes while you sit on it.
