Myusca

Myusca is a succubus fought in the Collaboration Scenario. She comes from Succubus Prison: House of Lewd Demons with Nemea and Vinum. She's a cruel succubus that enjoys driving her preys to despair before eating them. She is the boss of chapter 2

Biography
She first appears at the beginning of chapter 2, when she contacts Kazuya and several other people via telepathy to tell them that she will chase them all to devour them as they are imprisoned in a house. She herself shows up in the flesh midway when Kazuya regrouped with Hakunen, and proceeds to suck dry a youth the party came across. She then starts chasing them, forcing them to run away as she's way more powerful than they currently are. When she ends up following them in a room where several people took refuge, she drains a few people before leaving everyone else, temporarily satisfied.

The party then meets her again after encountering the White Rabbit, and is forced to fight her as she reveals her real form. The party barely manages to scratch her when the Proof of Collaboration on the back of her hand reacts. Her surprise is exploited by the party who flees the scene.

She shows up again at the end of chapter 6 when the party is about to escape, surrounding them with the support of Vinum and Nemea. Fortunately, they are saved by the intervention of Magatsu, Lauratt and Rigeo.

Before the succubi leave, Kazuya asks why Myusca has the Proof of Collaboration on her hand. She answers that she got it when she arrived, before being corrected by Vinum who reminds her that she got it from her first victim who was supposed to be the hero of their world, which surprises the succubi as he was incredibly weak. The succubi taunt the heroes as they're now down to six, but Kazuya tells them that he's determined to find a solution.

The trio reappears in chapter 8 as Kazuya and his group are fleeing Fulbeua and Musette. They chase the party and force them to go underground. After Vinum fights the group, a full fight blows out as Luka and his allies step in and rescue Kazuya's group from the Succubus trio. The situation becomes even more chaotic as Mysteltainn, Ogretooth and Executioner show up while chasing Lest and his companions. As they fight, Myusca ends up caught by one of Daimyokai's trap, and while she tries to break free, Vinum tells her to stop trying. The heroine accompanying Luka notices that both groups seem to be too wary of each other to work effectively, point upon which Vinum concedes. Eventually, the groups negotiate the succubi' retreat and Kazuya has Myusca give out the Proof of Collaboration to Luka before leaving.

They reappear during the banquet between the members of the alliance during chapter 10, as Musette is furious that they let the heroes go while they have their own agendas.

The succubus trio tries to attack another village in chapter 12, but is then intercepted by either Eden, Zion and Gnosis on Alice's route while they're engaged in a fight by Lilith, Astaroth and Morrigan on Ilias'.

She can be recruited with her partners in the post-collab as they returned to Finoa with the plan to "play" with the heroes through trials that force them to have sex with their partners to reach them. She disparages the heroes as they regularly break the rules or resort to violence to progress. Eventually, the trio fights the heroes and join them after being beaten, telling them that while they find the idea of fighting on their side fun, they hold no loyalty to them, so they shouldn't lower their guard.

Monsterpedia entry
"A being who arrived from another world. Further Details are unknown."

Attacks

 * Attack - One Foe, Physical Attribute
 * Artemis Grave - Four Random Foes, Physical Attribute
 * Full Charm Bow - One Foe, Physical Attribute, Death 10%
 * Instant Caress - Four Random Foes, Pleasure Attribute
 * Whirlwind - All Foes, Auto Hit, Wind Attribute
 * Kiss of Ecstasy - One Foe, Pleasure Attribute, Trance 75%
 * Delightful Hand Job - One Foe, Pleasure Attribute
 * Hecto-Deep Blowjob - One Foe, Pleasure Attribute
 * Breast Squeeze - One Foe, Pleasure Attribute
 * Energy Drain - Rape, One Foe, Pleasure Attribute, Drain HP
 * I'll Eat You All At Once - All Foes, Physical, Pleasure Attribute, Drain HP
 * Demon Eyes of Seduction - All Foes, Magical, Seduction 75%
 * Lily Ascension - One Foe, Pleasure Attribue, chapter 2 only

Chapter 2
The party is extremely limited for this fight. Kazuya and Hakunen should focus on damage dealing, while Lampas and Dream Fox are better remaining as support.

Any build for Kazuya will do, although keeping the gun specialization and switching job to God's eye can give access to Saint Rose with the smallest of grinding, which does extreme damage to Myusca. It is the same for Hakunen and Saint Fist.

As tempting as it can be to use Dream Fox's talismans, keeping her on support duty is important. "Song of Mahobora" will prevent status effects and keep your party mostly active, "Song of Cicada" and "Song of Defense" will limit damages and limit Myusca's recovering through the fight as she loves life-draining skills, "Song of Offense" will help end the fight faster than if talismans were used, while "Song of Energy" will help your SP dependent team to keep using their skills reliably.

Healing is to be done by Lampas on a "need" basis.

Real battle
The final fight against the three succubi is a relatively tough one. All of them possess a large number of party-wide status effect, high-damages attacks, and ways to heal themselves if not the whole party. Without resistance to climax, losing your whole party in the first turn is a dangerous possibility. Their attacks aren't limited to pleasure and wind, which means that you can't simply hope to reduce this fight to a cakewalk by bringing resistances to both. Fortunately, as they have limited auto-hit attacks, evasion and magic evasion/reflection is a valuable defensive option.

Your main target should be Nemea. Between her disruptive wave and her mass mega heal, she is the biggest source of annoyance for this fight. She presents an unusual weakness to ice, but holy attacks have a bonus against all three, while earth damage remains also quite strong (although it only does normal damage against Vinum). Setting combos over several turns is too risky to be worth it.

Trivia

 * The large orange creature appears for her "manticore" character-specific summoning skill. Its role in the original medium was to kill and devour everyone that didn't enter or exit the house by the main door, as well as eating the remains of the succubi's meals.
 * There is no Monsterpedia entry for the first version fought.