You might have noticed that there are no solicits for any Justice Leagues (Dark or otherwise), nor any Avengers no matter the cost (the entries linked are to provide context between the different roles, not to determine their existence).
That’s because Absolute Overpower is taking an MCU approach to the “big” superteams. They don’t exist until a big enough threat warrants them coming together. The Justice League or the Avengers are the “all-stars” of their universe, Earth’s Mightiest heroes, and that’s exactly how we want it to feel, here. The best of the best from all corners and campaigns of the Overpower Universe coming together.
Inciting Incidents
This begs the question, what sort of event or villain could bring enough heroes together to warrant calling them The Avengers or Justice League?
Campaign Bosses
As campaigns draw nearer to completing their main quest machinations of the campaign boss or bosses will be exposed. Some of these might spin out other villains or plot threads that the parties can’t stop allowing them to grow stronger and stronger and more dire until they require a Justice League to step in.
Campaign Events
Sometimes plots within a campaign quickly grow beyond the magnitude of what parties expect. Players might have to make choices with immense circumstances or might have to take control of universe-shaping powers or weapons to keep them safe from villains, instantly making the players and their parties worthy of being Avengers.
Raids
Raids are sitewide bosses that are much more powerful than those being faced in individual campaigns. They offer enough of a challenge that players from all across Overpower campaigns will have to band together to stop them. Think Doom or Darkseid, or maybe even a particularly ingenious plot from Kraven the Hunter.
Super Dungeons
A super dungeon is similar to a Raid, in that it offers any player no matter their team or campaign, a chance to team up to stop a looming threat. Where Raids are usually newly forged alliances to stop a supervillain or supervillains, super dungeons are more likely to be an event, or instance like universes colliding, or having to stop NYC from being overrun by escaped villains.