The Writing's On the Wall [Ninjago]

Lord Garmadon was supposed to conquer the world, really, that's what the whole point of this was, unleash the power of the Great Devourer (or something along those lines), bring Ninjago under the Overlord control.

He didn't count on all 16 realms merging.

That's the last thing everyone heard about him, apparently he had turn tails and run off many years ago, with now the realm of Imperium gaining considerably power over one part of this new merged world.

Now trying to control his evil urges and keep a low profile he has moved to a smaller city outside Imperium, the crossroads, with his son Lloyd and a group of misfit teens under his care, maybe, just maybe, they would be the key to getting an upper hand against Imperium... or the key to him gaining enough power to control all 16 realms.

He will figure it out as he goes.
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Tldr. Kinda rewite/mix of a universe where the merge happened many years before the Ninjas were even born... and now Garmadon has to babysit a bunch of kids.