Beelzebubs

Beelzebub are a trio of fly demons. They were so powerful and uncontrollable that Alice the I (First), the founder of the Monster Lords, was forced to seal them within a box. Captain Selene would eventually come across that box and accidentally release them, however she managed to contain them off before she met her demise.

Each Beelzebub has a colored carapace that matches their hair, along with pincered arms and an abdomen lined with breasts of varying sizes. Beelzebub A has a purple carapace and has six enormous breasts on her abdomen. The busty Beelzebub B has a red carapace and an abdomen with lots of large breasts while the petite Beelzebub C has a green carapace with an abdomen lined with smaller breasts.

Selena, a woman who claims to be Selene's granddaughter, requests Luka to close the box that was responsible for her grandmother's death, in return Luka receives the Purple Orb.

When they reach Selene's ship, they notice a barrier. According to Alice, the barrier is keeping something in.

Upon reaching the captain's room within the ship, Luka encounters the trio of Beelzebubs. Barely holding out but managing to seal one, Alice steps in and assists Luka, obliterating the other two. Fearful of the Monster Lord's power, they flee.

Battle Overview
Beelzebubs are an extreme hassle; they have many restraints and all will attack during their turn, due to this they can easily overpower Meditation. The best way to hold out is use Undine + Serene Demon Sword followed by Gnome + Sylph + Earth Rumbling Decapitation.

After Luka seals the Beelzebub A, Alice steps in and fights alongside Luka. The remaining Beelzebubs then direct their attacks to the Monster Lord, only to be obliterated by constant use of Monster Lord's Cruelty. Sustaining enough damage, Beelzebub B flees, followed by Beelzebub C.

If Luka is defeated, he is mounted on A's abdomen for a vaginal intercourse as she lays eggs in his rear.

Trivia

 * Beelzebub A’s design seems to reference to an illustration in the Dictionairre Infernal by Jacques Auguste Simon Collin de Plancy. The depiction of the fly-based beast inside the book features skulls and crossbones on its wings.