This takes place in Soul reaper's mind after The Ultra King took control of Soul Reaper. (The boss escapes once beaten! Soul reaper is not freed until he is fought a second time near the end of Season 2.) THE INTEGRATED INSURECTIONIST can be the Season 2 Final Boss (It gives Kaboom more time and less pressure). We'll say that Omega was Season 1's final boss.
Unfinished because I only have one day (This Day) left on scratch before I have to log off for who knows how long. (Use a Darker color palette like Soul reaper or the background) All that is needed is: Attacks, Boss HP, a starter hero, and stat limits . (Intro and outro cutscenes are OPTIONAL!)