(Dream/Rever)
Backstory; During the actual Dreamtale's Timeline (Where Nightmare ate the Dark Apple) something pushed Dream to use a Time Travel Spell to go back to the Past to change the future in order to SAVE his brother from a path of darkness. Of course, Dream cannot stay long since his Time Travel Spell is temporary. He sent himself back to when him and Nightmare were more young or just still inexperienced. (Not as kids though, just preteen or such) due to Dream's limited time on staying in the Past, he had no time to properly explain to his past self on what to do to prevent it so he showed him visions of what HE went through after Nightmare ate the apple. After that, future Dream vanished after saying "Please, do whatever you can to save him, be there for him" and Dream was left with a look of trauma and on the verge of tears. Taking in what he had just witnessed.
This had wind up in the beginning of Dream's own path....
Dream had stolen one of the black apples from the tree in order to experiment it. Injecting one of the golden apple's own magic into the black apple. Dream spent the day secretly taking small bites of it thinking it worked and he wasn't corrupted. However, Dream's logical sense started to slip eventually and his sense of moral was warped due to the combine magic he consumed.
Dream locked himself in the library to study all sorts of magic that he can utilize to put his plan into action. He became stronger, smarter, seeing things more...."clearer."
Once he exited the study room hearing of Nightmare's achievements. He greeted his brother with a smile and told him he knew how to make things "Better"
Dream had begun expanding a Kingdom that would promote Positive feelings. At first, Night saw no issue until he found out the Darker side of it. Dream would imprison and brainwash people if they do not agree with his laws which were difficult to follow. (Examples like: No mourning) No soon did Dream take over Dreamtale and turned it into a Golden Empire. Dream then made the decision to expand it further ACROSS THE MULTIVERSE! This was enough for Nightmare to be forced to leave since the overwhelming energy was too much.
-Dream strongly believes he did the right thing and that him and Nightmare can be happy. That's why when Night left he was entirely confused and went against his own rules to mourn, not understanding why until he puts it in his head that his "Precious and pure brother had been corrupted" which is why they disagreed and he ran away.
-Dream's personality had now become of that of a tyrant yet still well-mannered. He's polite but strict and has a large distaste for behavior that he sees can lead to "Corruption." To add into his Tyrant-like behavior he's also rather a hypocrite but knows how to hide it. He will go against his own rules if desperate enough depending on the situation.
Despite this though, Dream still has rare moments of his old personality that tend to spur when thinking on Nightmare. (Though he glares if seen doing so)