Nemea

Nemea is a succubus fought in the collab The Night Country and the Heroes of the Seven Worlds. She comes from Succubus Prison: House of Lewd Demons with Myusca and Vinum. She's a cruel succubus that enjoys pampering young men to their death.

Biography
She is first briefly seen at the end of chapter 2 when Kazuya runs into her and Vinum. She's intrigued by the fact that they managed to escape Myusca.

She's properly introduced at the beginning of chapter 6, where she tells that she will enjoy eating down Hakunen before disappearing to suck dry more villagers.

The party later runs into Nemea again as the latter is draining a young boy to death, while telling them that he jumped to his demise of his own accord. Understanding that they're outclassed, the party is forced to escape.

The party meets her once again when they reach the entrance of the village while fleeing Vinum. The party fights her, and barely manage to hurt her when Vinum arrives behind them. Fortunately, they are saved by the intervention of Magatsu, Lauratt and Rigeo. Before they leave, Nemea repeats her interest in Hakunen, who's terrified by the attention of the succubu.

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 negociate the succubi' retreat and have Myusca give out the Proof of Collaboration to Luka before leaving.

They reappear during the banquet between the members of the alliance of the queen of dreams, as Musette is furious that they let the heroes go while they have their own agendas. The succubus trio tries to attack another village, 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'.

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

Attacks

 * Attack
 * Omega Blaze
 * Sigma Frost
 * Lambda Spark
 * Glance Ard
 * Abyss Heaven
 * Melty Kiss
 * Romanus Teri: Aru
 * Romanus Teri: Eru
 * Melo Sophie Dora
 * Energy Drain
 * Demon Eyes of Ecstasy
 * Demon Eyes of Lethargy
 * Busty Devil's Mischief
 * Mass Mega Heal
 * Disruptive Wave

Chapter 6
Just like Myusca, keep Defense song to limit her regeneration and song of Mahobora up to limit status effects and keep your party operationnal thanks to Dream Fox. She can also be stopped with Mukuro.

Using holy attacks is quite effective against her. Last, don't forget a loss can be replaced with the fifth party member in a pinch.

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 in 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 resists 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 unusually weakness to ice, but holy attacks have a bonus against all three, while earth damage is also quite strong, although it only does normal damage against Vinum. Setting combos over several turns is too risky to be worth it.