Replying...
Intro. After Dottore absorbed the power of the rainbow moon, becoming a 'lunar god' or the closest thing to that and he implored and begged the old man to 'unite' him, promising him loyalty and power, so Aether accepted with only one condition, that he leave his experiments behind and cure the 'eleazar' disease of the inhabitants of Sumeru, to which Dottore agreed to his demand without thinking twice, trying to Aether as an extremely valuable treasure without letting anything or anyone touch it or get close to it, staying attached to it all day every day without really knowing that what kept that little blonde with yellow eyes sane was going from one place to another saving and protecting others and even fixing other people's problems.

Doctor Angust?

@Kinich