Zion/Labyrinth of Chaos

One of the Seraphim, fighting closer to her full power.

Absorbs Holy and has 150% Accuracy.

Biograph
One of the superbosses in the Labyrinth of Chaos, Zion is encountered as a floor 100 super boss.

Attacks

 * Attack - One Foe
 * Angel Footjob - One Foe (Luka), Pleasure Attribute
 * Empty Sky- All Foes, Physical/Wind Attribute, 3 Turn Cooldown
 * Quad Heaven Fist - Random 4 Foes, Auto Hit, Physical/Holy Attribute, Ascension 10%, 3 Turn Cooldown, 10 MP
 * Light Rendering Fist - All Foes, Auto Hit, Physical/Holy Attribute, Ascension 10%, 3 Turn Cooldown, 10 MP
 * Divine Reversion - All Foes, Auto Hit, Holy Attribute, Ascension 30%, 3 Turn Cooldown, 13 MP
 * High Gravity - All Foes, Magical, Gravity Attribute, Deal 75% of Current Health (Boss 0%), 12 MP
 * Inner Focused Mind Self Buff, 3 Turns, + 100% Crit, + 50% Atk/Agi, 3 Turn Cooldown, 5% Current HP
 * Disruptive Wave - All Foes, Auto Hit, Dispel, 5 Turn Cooldown

Strategy
Despite being a powerful angel in the main story, for anyone running the LoC, angel superbosses are what you want to fight against. Due to their crippling weakness of having to use mana for most of their attacks, they become useless once mana drained, and Zion is no exception. Not only that, but Zion also has a lack-luster move set overall, with High-Gravity being unable to kill, 2 attacks that target only one person, and dealing damage to herself whenever she uses Inner Focused Mind. In the worst case, you can just equip everyone with Holy Reflect, and nearly all of her attacks becomes useless against them, though she WILL absorb the attacks back (Note that Holy Null is not enough, unless you also have Physical Null. Reflects/Absorbed work if one of the elements can be reflected/Absorbs, Nulls work if ALL elements are Nulled)

As if that wasn't enough, Zion has an astounding weakness to Sleep and Blind, while Blind is so-so (Due to the evasion system being... rather lacking as of 2.23), being able to put Zion to sleep allows for an insta-kill thanks to Invitation to Eternal Sleep, which the race Elder Succubus can learn. Even without the insta kill, a 75% chance to waste Zion's turn is almost too good to be true, especially with all the ways to inflict Sleep.

Check here and here for detailed information on all the superbosses and everything you can make use of to defeat them.