Leviathan/Labyrinth of Chaos

In the Labyrinth of Chaos, Leviathan is closer to her full power.

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

Attacks

 * Attack - One Foe
 * Admiral Wild Dance - One Foe (X4), Physical Attribute, 3 Turn Cooldown
 * Darkness Drive - All Foes, Auto Hit, Dark/Physical Attribute, Death 10%, 3 Turn Cooldown
 * Dark Spear Dance - Random 4 Foes, Auto Hit, Dark/Physical Attribute, Death 10%, 3 Turn Cooldown
 * Poseidon's Thunder - All Foes, Magical, Lightning Attribute, Shock 50%, 3 Turn Cooldown
 * Crystalline Breath- All Foes, Auto Hit, Ice Attribute, Ice Attribute, 3 Turn Cooldown
 * Maelstrom - All Foes, Magical, Water Attribute, 3 Turn Cooldown
 * Lamia Coil - One Foe (Luka), Bind 100%, 6 Turn Cooldown
 * Constrict - One Foe (Binded Luka), Auto Hit, Pleasure Attribute
 * Full Power - Self Buff (1), Attack + 300%, 3 Turn Cooldown

Strategy
A perfectly normal super boss among super bosses... not too hard, but can be dangerous if she's your first one. She has a super glaring 200% weakness to pleasure and lesser weaknesses to lightning and sonic, unlike most super bosses whom usually start at 100% and only go down. She can also be stun locked with a 50% weakness to Stun and a 25% weakness to Stop. As for her move set, she has no moves that can be removed using mana drain, so don't bother. However, Waning Moon Dance will help against most of her attacks, except for Darkness Drive/Dark Spear Dance and the various breathes. All in all, Leviathan is a good example of the average difficulty of the part 2 bosses. If you can beat her, your team is good enough to continue onward.

All in all, she's on the lower end of the tier list of super bosses.

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