Beating the final boss of N3 is much easier (and do-able) by doing the following:

1. Increase Inphyy's level to nine for her final attack.

2. Attain the accessory "Deadly Armband" as a randomly dropped item from various Army of the Night enemies.

3. A strong weapon. The Klausorus is an award for S rank in Inphyy's Eauvarria Mountain Pursuit.

4. Do Inphyy's final aattack move (GREEN, GREEN, YELLOW) on the boss when it is distracted and dash to evade all retaliatory attacks.

5. As a safety net, consider equipping the accessory "Demon Gloves" if necessary.