Ortho overrides all of STYX’S system access codes and possibly takes over the entire island, despite how he should not have the authorization to do so.
Ortho then explains his plans in more detail: To have Phantoms coexist with other living creatures by opening up the Underworld and filling the world with blot, where he and Idia will be on top thanks to their blot-incinerating curse, at which point they will be able to have friends over whenever they want to “play video games and watch movies together…and when they go home, we won’t have to erase their memories.”
Ortho reveals himself to be Idia’s actual brother and Idia immediately allies with him, opening the gate to the underworld (his unique magic) and overblotting.
Ortho shares his plans with the other students and they each decide to stand against him for their own unique reasons, to which Ortho responds, “Goodbye then.”
When Ortho realizes that the others intend to stop him, Idia tells him to “go play with ‘em some.”
Ortho first assigns each group of students a video game to get started, then sends Vil’s and Riddle’s teams on scavenger hunts for the ID cards that will let them escape from rooms with caged Phantoms.
(Taking offense at a comment that Leona makes about robots acting predictably, Ortho assigns Leona and Jamil the different task of finding a password.)
For Vil’s team’s second Phantom room Ortho pretends to trap a STYX researcher in a cage, but it is revealed to be a Phantom imitating a human.
In the rooms for Leona and Riddle’s teams, however, he creates legitimately frightening situations that are revealed to be fake: convincing one STYX researcher that he is in danger of drowning (Ortho tied him to a heavy, sinking cage in chest-high water) and another researcher that she was trapped in a cage with a Phantom (while she is really trapped in the cage, the “Phantom” is revealed to be a broken down Charon suit).
For Vil’s team’s third Phantom room Ortho leaves a bound and blindfolded researcher in a room with Phantoms that are beginning to wake up, and researchers in the two other rooms with at least one Phantom that is actively on the loose (and both Orthos are very much aware of exactly what rogue Phantoms are capable of doing to human beings).
Ortho emerges from the Underworld as a giant creature, saying, “Turns out the curse I have is actually a blessing that empowers me. The Underworld’s filled with blot, So I kept absorbing it and burning brighter…until finally, I became the Underworld itself!”
As the physical incarnation of the Underworld, we see that Ortho is capable of rapidly aging those who get too close to him.
After taking direct hits from thunder spears by Riddle, Azul, Jamil and Leona, Ortho says that he can barely move, and we learn that while he can control any STYX-made technomantic weapons, he has no control over ancient magical artifacts.
After taking a final hit from Vil, Epel and Rook, Ortho begins to fall back into Tartarus and Idia goes to join him (“I’m not leaving you this time”), with Vil following after to save him.
We see in a flashback original-Otho encourage Idia to go on adventures so that he can be a hero before he grows up and becomes trapped by the obligations of the Shroud family.
Idia invites Ortho along, hacking into STYX’s security and inadvertently allowing a monster to escape.
The monster kills Ortho and Idia decides to recreate him on his own, inventing “the world’s first self-improving technomantic humanoid.”
Twisted Wonderland Reference Note 