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Caster's Skill Mantra: Merciful Sky

To upgrade Caster's Mantra: Bestial Sky to Merciful Sky, you must kill 5 of the Nephilim enemies throughout the game. Afterwards, you can initiate a conversation in your Private Room which will then upgrade Bestial Sky to Merciful Sky. Merciful Sky increases the next spell's power more than Bestial Sky. It also increases the MP cost from 30 to 60.

UnlockableHow to Unlock
Kill 5 Nephilim enemiesMantra: Merciful Sky

Contributed By: Terrorbreak.

Noble Phantasms

These can Be Unlocked on Chapter 5, before the boss battle with Assassin

UnlockableHow to Unlock
Use Caster and use 9 skills to be able to activate on skill listBlessings of Amaterasu
Use Saber and activatable on skill list on the 4th roundTheather of the Damned
Use Archer and use Pre-Projection 6 timesUnlimited Blade Works

Contributed By: DarkZer00.

Saber's Skill Thunderous Applause

Saber's skill, Artillery Applause can be upgraded by using around 100-200 items during your run through the arena. After you used enough items you'd be able to speak with saber in your private room. If eligible, she'll be talking about wasteful spending and you'd get the confirmation that Artillery Applause have been upgraded to Thunderous Applause. It will cost 60mp instead of 40mp.

UnlockableHow to Unlock
Use 100-200 ItemsThunderous Applause

Contributed By: Venificae.

Unlocking Special Boss

After the 7th week on your 2nd playthrough, If you finished all of Taiga's request, she will give you a message that the arena is dangerous. There you will find a Special Boss fight at the end of the floor.

UnlockableHow to Unlock
Finish all of Taiga's Request on 2nd playthroughRyougi Shiki

Contributed By: Venificae.

Easter Eggs

Reference to BlazBlue

After the 3rd round, at the projector in the Multimedia Room, when you inspect it a system error will occur. Along the 2nd line of the message, you can see the system referring to "BlazBlue."

Contributed By: ZeoKnight.