Ogretooth

Ogretooth is a succubus added in the Collaboration Scenario. She comes from ROBF4SU with Novissa, Tarsa, and her sisters Mysteltainn and Executioner

Biography
She first appears at the end of chapter 1 with her two sisters as they are attacking Lady’s Village by plunging everyone into deep dreams. Lauratt and Rigeo meet them, and are aghast at their action.

As Executioner takes a break from her fight the duo, a small boy comes out from a building and surprise them. When Ogretooth tries to make a move, Magatsu steps in from nowhere and knocks her back. Mysteltainn hold back her sisters, and the trio leave.

They reappear in chapter 4 as they make their way to Izumo Village and discuss the "Queen of Dream"'s plan to bring in the "Land of Night". Ogretooth gets intercepted by Rovissa who is supported by Lars, and while the two fight, Executioner and Mysteltainn attack the villagers. After getting pushed back, Ogretooth unleashes her power, but Mysteltainn tells her to hold back. After transforming most women into nightmares, the trio leaves.

They show up once again during chapter 9, as Lest's party is stuck in the basement of the castle. She temporarily chases the hero alone, but is either beaten back or avoided entirely. With her two sisters, they chase the hero and his allies until they eventually end where Myusca, Vinum and Nemea are fighting Luka and Kazuya's party. She gets engaged in a fight by Alicetromeria/Lucifina-Chan and Micaela-Chan while Mysteltainn fights the heroes they were following.

As the situation becomes critical for them, the fight slow down as the heroine accompanying Luka notices that both succubi trio are ready to jump at each other's throat. While Ogretooth wants to fight on, Mysteltainn and Vinum themselves recognize the issue, and back down with their own partners after some negociations.

She shows up with her two sisters again in chapter 10 during the reunion between the members of the Alliance, and they make it clear that while they will help Est accomplish her plan, they have their own agendas.

They reappear again in chapter 12 and get in the way of the hero's group as the latter assault the Château des Romances, but are engaged either by Lilith, Astaroth and Morrigan or Eden, Zion and Gnosis depending on the route, leaving the path for the hero's party free.

They show up in the post-collab in Fairy’s Island. They reveal their true form and engage the party into a fight. After they've been beaten by the hero's team, they tell that they intend to settle down, but that they're looking for a weapon effective against angels as they risk being at war back in their world. To recruit them, Luka must bring them the "Shards of the Immortal-Trashing Whip" obtained by beating Daimyokai in the Snow Shrine during Musette's recruitment quest.

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

Attacks

 * Attack - One Foe, Physical Attribute
 * Explosive Fist - 4 Random Foes, Physical Attribute
 * Flame Dance Fist - One Foe, Fire Attribute, Burn 10%
 * Ice Rebellion Fist - One Foe, Ice Attribute, Freeze 10%
 * Rock Drop - All Foes, Physical Attribute
 * Strong Hand Job - One Foe, Pleasure Attribute
 * Busty Paizuri - One Foe, Pleasure Attribute
 * Focused Spirit - Self Buff, Attack +100%
 * Reversal - Self Buff, Counter (1 turn)

Chapter 4 and 9
First thing: Do not forget to equip abilities at the first occasion given.

Lars being roughly as useful as a rock for this fight thanks to a relatively low damage output and almost non-existant support abilities, it will be up to Rovissa to win this. Her magical spells are what will put the hurt, and she can heal herself with her life draining skill in a pinch.

Ogretooth is resistant to most status effects, so stopping or slowing her won't work. The best way to take her down is to enhance Rovissa's spells before casting them and to exploit the occasionnal charge from her magic staff. Mana isn't an issue for this fight, so fire away.

Should you run into her during chapter 9, you will fight the same version.

Real Fight
The trio of succubi can be dangerous thanks to its numerous powerful attacks, although they use unusually few Status Ailments. Keeping a protection against those is still preferable though. Blinding them to limit the number of attacks they land can be useful. All three succubi are weak to holy, making those attacks particularely effective against them. However, when it comes to actually taking them down one by one, each target has their pros and cons.

Executioner possesses both powerful and weak skills, and with a limited number of HP (300K to the ~500K her sisters have), it can be tempting to take her down first.

In the meantime, Ogretooth has strong attacks that can deal an impressive amount of damages, making her more dangerous on the long run.

Last, Mystletainn is the main source of Status Ailments with party wide binds, silence, petrification and death.