Argalia's plan (Theory)

[jbedford21]

I believe he is gathering distortions in order to recreate the pianist, the black box mentioned in the distortion detective might make that possible since they could be found within L corp's nest and can absorb the distortion from within several people and force it into someone. If he were to channel the collective distortions within his ensemble to himself, he could potentially create/become a second pianist or something similar to it considering his goal and what he considers as his purpose in life. If he can take the light from the library it might even be possible for him to manage that collective mass of distortions and make it into an E.G.O, the bodies of the Thumb members is probably how he plans to create his "instruments". The voice in his heart could be Carmen who has been the source of the distortions manifesting as abnormalities or as E.G.Os. Considering that he isn't going against that voice, it is still possible that he might end up becoming an abnormality.

This is just a personal thought so I doubt it would happen, but it is still a possibility.

[Araders]

It seems to me everything is much simpler. Which is 100 percent clear, he needs the light of the library - the dialogue before the fight with a purple tear. In the same dialogue, he says that he has no desire to live, since initially his desire was closely intertwined with his sister, but after her death only emptiness remained in his soul.
Keep this in mind, let's move on.
During Argalia's visit to the library, he said something like "Angelica wait a little longer." To summarize, one of his goals is the possible resurrection of his sister. There are hints about the global goal, but everything is vague enough to say something for sure.

[Rabbit]

I think maybe more so might be trying to create bad ending from lobotomy corporation using the light

Distort everyone