Morrigan/Labyrinth of Chaos

Morrigan is a Succubus and one of the Lilith Sisters in Monster Girl Quest: Paradox.

Biography
Like the other bosses of the Labyrinth of Chaos, 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.

Attacks

 * Succubus Arts - One Foe, Physical, Physical/Pleasure Attribute, Climax 50%
 * Delta Aero - All Foes, Magical, Wind Attribute, 20 MP
 * Tera Cyclone - All Foes, Auto-Hit, Magical, Wind Attribute, 3 turns cooldown,
 * Glans Ard - All Foes, Magical, Pleasure Attribute, Trance 75%, 20 MP
 * Lilith Orgia - All Foes, Physical, Pleasure Attribute, Horny/Trace 75%
 * Psycho Drain - One Foe, Physical, Pleasure Attribute, HP drain
 * Psycho Heaven - One Foe(x4), Physical, Pleasure Attribute
 * Final Demon Eyes - All Foes, Magical, Poison/Blind/Silence 50%, Confusion/Sleep/Paralysis 25%, 15 MP
 * High Gravity - All Foes, Magical, No Attribute, 12 MP
 * All Slow - All Foes, Magical, Slow 75%, 8 MP
 * All Cancel - All Foes, Auto-Hit, Magical, Dispel, 5 turns cooldown, 6 MP
 * Extreme Gale - Self buff, 3 turns, +200% accuracy, +100% physical evasion

Strategy
Check here and here for detailed information on all the superbosses and everything you can make use of to defeat them.
 * Most of her attacks can be dodged/reflected.
 * You can inflict Silence on her with reflected spell which disallows her use of dispel all.
 * 75% Physical Evasion means such attacks need (de)buff to reliable hit, largely Bullseye Song or Slow/Stop.

A battle against her with only part 1 equipment, no Crisis Hairpin and no stats upgraded can be seen here.