I'll be updating this with content when the time comes - so for the time being, here's some basic info. These Mamonos are based on the in-game universe of Illusion Connect.
The Lens-Born are Mamono that aren't inherently born in the Mamono Realm. They are 'created' when the aspirations and desires of those who have been named and have lived a lifetime ago find their souls adrift to the Mamono Realm - and are then pieced together into a new entity that embodies both the Mamono Realm's whim and fragments of their former identity. The core of a Lens-Born is their Lens - a crystalline center that hosts the soul of their previous existence. This is what they have instead of a normal living being's heart, and shattering the Lens of a Lens-Born creates a literal 'black hole' in their chest that corrupts them until they turn into a corrupted life form whose only driving force is a desire they once had turned obsession, known as an Umbral.
Umbrals can further in transformation, becoming the source of a reality-warping Demon Realm that traps individuals as they are subjected to the obsessive notions of the corrupted Mamono. Choked by Demonic Energy, they slowly configure into Umbrals that follow the central Umbral's whim, while the latter becomes an Umbral Lord.
Lens-Born are aware of the threat an Umbral Lord can pose, as they can swallow entire nations under the vision of their obsession and turn people into defunct Umbrals. This is why Lens-Born are compelled to dispel Umbrals before they could turn into Umbral Lords, and take down Umbral Lords by restoring the Lens lost to them. This technique is known exclusively to the Lens-Born, and they share this only to people chosen in their eyes known as 'Radiants'.
All Lens-Born live in the 'Dream' - a fabricated adaptation of the Mamono Realm. Within the Dream, places that are bustling with life are abandoned and uninhabited, and supposedly-empty settlements are vast cityscapes. For the most part, Lens-Born are unable to interact with people and Mamono of the real world unless they are Radiants, whom they can meet and visit in the realm of sleep. Umbrals, however, are able to escape the veil between the real world and the Dream to sate their desires outside of their home realm. Certain Lens-Born are also able to leave in and out of the Dream due to the vast amounts of Demonic Energy and magic potential within their Lenses.
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Mental note : Most of the Lens-Born are categorized under the Succubus family of Mamono, as they are all 'phantasm' Mamono by nature and exist within the realm of sleep. Sub-specie clauses are included when a particular Lens-Born has parts and/or features that eccho to existing Mamono families such as Harpies, Lizardmen, Scyllas, etc.
Ouroborian - Fennebeth, Ashwaya, Gemmy, Peafowl, Rotania, Barinas, Astaroth, Annis Dora, Seeger, Amon
Liberosian - Hersey, Mavis, Yuffie, Natata, Sophie, Vivian, Hatter, Flora and Nono, TwinFlora, Rubi, Lily,
Phoenician - Brooke, Iason, Selena, Miyuki, Phoebe
Tobunkai - Chiyo, Hachi-shiki, Mei, Kanata, Shinai
Seedarian - Mia, Domessa, Elena, Averyl, Lunar, Nefir
Muscipulan - Adelais, Cubie, Saya, Kichou, Victoria, Anna
? - Sonia, Xinyuan
(Content will be added later on!)