History NightmareFuel / UnderNightInBirth

** So far, only Hilda has amassed enough EXS for this to apparently become a problem... at least until ''[Sys:Celes]'' shows that there's another member of the cast who could potentially end up an In-Birth... ''Carmine''. Possibly more terrifying is the fact that his ending has him fully prepared to die and give himself up to his alternate "self", all while it goads him into giving up entirely... before Carmine manages to turn that entirely on his head and ''kill off'' that alternate self, taking the power of a Re-birth with his original, bloodthirsty personality fully intact. The [[https://static.wikia.nocookie.net/in-birth/images/8/8f/Ed003car.png/revision/latest?cb=20240126131810 actual design of his Re-Birth form]] isn't particularly pleasant either, with half of his body becoming twisted and warped, crystals of blood embedding themself in his left arm, and the fact he has 3 extra eyes.

** So far, only Hilda has amassed enough EXS for this to apparently become a problem.

** There's also how he communicates. He doesn't simply talk out loud, he directly transfers his stream of thought to people's heads, and you get to hear this in the form of a booming, distorted, barely human sounding voice. The noises he usually makes in the outside world? [[HellIsThatNoise Bloodcurdling, inhuman shrieks]]...

** In ''[Sys:Celes]'', Merkava's Arcade Mode could go one of two ways depending on if you use a continue or not. [[spoiler:Both endings involve him consuming Kuon, and being overtaken by his hunger for EXS, with some final remarks from his human self about the beast overtaking him. If you used a continue prior to finishing Merkava's Arcade, the beast does ''indeed'' overtake him completely, warping him into [[https://i.imgur.com/lEpDnVT.png even more of a monstrosity]] with what little heart he had left completely gone.]]

* ''VideoGame/BlazBlueCrossTagBattle'' reveals how an Autonomic Nerve is created, and [[FridgeHorror in hindsight]], it just might be the scariest thing in the game. Autonomic Nerves are created when a pre-created body is infused with a human soul, with all memory of who they were prior being erased. The idea of taking away someone's memories and soul just to turn them into a weapon is bad enough, but Vatista's number implies that ''over 10,000'' Autonomic Nerves have been made. Even worse, the bodies seem to come with strict programming that severely limits their freedom of action. In essence, [[AndIMustScream an Autonomic Nerve is a human soul sealed into an immortal body that they have very limited control over, and when the programming takes command, they have no choice but to oblige and destroy whoever it is that had the misfortune of crossing paths with them]]. Which, in retrospect, [[NotSoDifferent isn't that different a situation than Merkava's]].

** Though, this might not be the case, since in Vatista's Arcade path, Merkava refers to her as an "artificial human with an artificial soul".

[[caption-width-right:350:Uh-oh, Roger stumbled too close to the Abyss. I hope he's oka- [[EldritchAbomination JESUS CHRIST!]]]]

* Kuon explains the true and ugly nature of EXS and what In-Births put at risk when trying to attain more power. The term "In-Birth" is pronounced similarly to "inverse" and it turns out that it wasn't just a coincidence. Recall Yuzuriha's lesson on the Hollow Night and Voids and how In-Births are created. All humans have a latent EXS within them and when a Void takes a bite out of them, their chances of recuperation depend on how much EXS is taken out of them. In-Births are created when a Void takes a non-fatal amount of EXS out, but put something foreign inside of their victim that replaces the consumed EXS. That foreign element is what triggers a successful creation of an In-Birth but it is that same foreign element that harbors something else. Kuon states that another "self" is born within an In-Birth and as someone draws more EXS to their own, that other personality grows more prominent. Kuon further explains and warns Hilda that becoming a Re-Birth is akin to turning one's body into that of a Void, and Hilda admits to feeling that she's been pursuing further thrills to sate her thirst for excitement. This uncharacteristic tendency and shifting of personalities akin to a Void is the beginning of the process of losing one's own self and letting the alternate ego take control as they seek more EXS. All of this just from gathering more EXS, it's almost unimaginable if one tries to contain the mass of EXS the Abyss lets out so it could only get worse. Once someone actually reaches the state of a Re-birth, their old and original self will cease to exist.

** To start, he's a Void, so he's already got points for being an EldrichAbomination alone. But that's not going into how he looks. He's a lanky and unnaturally tall humanoid... ''Thing'' with thin, spindly arms and a strange, bird-like face with pin-prick white, unblinking eyes and a maw full of [[MoreTeethThanTheOsmondFamily teeth]]... Teeth that look way too similar to that of a human's.