Minagi (魅凪) is one of the Six Ancestors, of the Succubi bloodline. She is infamously known as the "Great Whore of Babylon" due to her immense sexual skill, notably the Great Barrier of Babylon that raises sexual excitement in human males to the extreme, and is the most hated monster by Goddess Ilias. She also created the Lilith Sisters.
Monster Girl Quest trilogy
While Minagi makes no appearance, her moniker is mentioned a few times in Chapter 3.
When Goddess Ilias assaults the entire world and assigns Black Alice to attack the Succubus Village, the leader of the attack sent there, Eva, erects a large barrier known as the Great Barrier of Babylon. According to Alice, the barrier is a prohibited art that sends human male's sexual excitement to maximum levels, causing them to ejaculate mindlessly from simply being touched or seeing a woman; the barrier then absorbs the semen and converts it to energy for the caster. Luka is mildly affected by the barrier due to his immense strength and the sheer difficulty of reproducing such an ancient art. However, even after Luka and Alice defeat Eva, the barrier remains in effect due to its self-sustaining properly; it is only dispelled when Amira and her Unfortunate Friends snap the men out of their trance and stop fueling the barrier.
Lilith & Lilim are surprised about seeing the Great Barrier of Babylon in their era, created by the legendary Great Whore of Babylon. They comment that while they are considered legendary succubi themselves, they are not in the mythological class and may have been confused with the Great Whore of Babylon.