Reaper/Labyrinth of Chaos

Reaper (死神, Shinigami), a much more dangerous variation of the one found in Hades.

Biograph
The most powerful of the super bosses in the Labyrinth of Chaos of Part 1 and, like the others, you can’t talk to her; there is no rape scene upon being beaten by her, and you shouldn’t be able to beat her by normal means.

Attacks

 * Reaper’s Requiem – All Foes, Physical, Physical Attribute, Death 75%
 * 13 the Punisher - One Foe, Physical, Physical Attribute, Death 50%
 * End of End - All Foes, Auto-Hit, Holy/Dark Attribute
 * Shinigami’s Scythe - One Foe, Physical, Death 100%
 * Scythe of Confusion - All Foes, Physical, Confusion 75%
 * Final Mystic Eyes - All Foes, Magical, Poison/Blind/Silence 50%, Confusion/Sleep/Paralysis 25%, 15 MP
 * Hades Inferno - All Foes, Magical, Fire Attribute, Burn 10%
 * Obscene Requiem - All Foes, Physical, Pleasure Attribute, HP Drain
 * Zero Universe - 9 Random Foes, Auto-Hit, Holy/Dark Attribute, 3 Turns Cooldown
 * Heaven & Earth Destruction - All Foes, Auto-Hit, No Attribute, 40 MP
 * Zero Shift - All Foes, Auto-Hit, Dispel, 5 Turns Cooldown, 20 MP
 * Chaos Drive - Self Buff, 3 Turns, Time Stop, 7 Turns Cooldown, 50 MP

Strategy
The strongest of the super bosses in the Labyrinth in Part 1 and the MP Drain strategy is highly recommended, also having the benefit of denying the use of Zero Shift, which has a high potential to end the fight. The basics of the super bosses apply, but there are a few things one should keep in mind: Check here and here for detailed information on all the super bosses and everything you can make use of to defeat them.
 * Holy Martyr and other such skills will not activate during Time Stop.
 * Skills that can activate at the end of turn from characters such as Naia (100%), Mimi (33%), Pochi (33%) and Panty Sensei (25%) immediately interrupt Time Stop.
 * Ongoing skills that have an effect at the end of the turn (Request Reinforcements) can also use up some of the turns of Time Stop. 1 if one person, 2 if more.
 * Zero Universe doing 9 hits means it can very likely end up killing someone even with multiple layers of Vicarious Clara so keep up enough to make that unlikely.

Battles against her with only Part 1 equipment, no Crisis Hairpin and no stats upgraded without Vicarious Clara and with it.