Okay, first, there was nothing, then came the Imaginationalists, they weren't wizards or kings or legendary heroes, they were normal, like you and me.
So, this is an imagination game, so we're all floating right now, but not for long! I imagine a floor. Okay, now we are on a white floor. Anyways, there is no character sheet, anybody can join! But there are some rules...
You can imagine anything, but you can only imagine 2 things each turn, you can imagine good things or bad things, for instance: you could say... "(guy) I imagine a cake that me and benni could share." or... "(guy) I imagine a wolf that attacks benni." and I can block the attack "(me) I imagine a yummy steak for the wolf to chew on." you could try to counter attack or you could focus on something else, but if I can't think of anything to counter attack with I say "(me) I can't think of anything." I then let the wolf strike me down and I wake up, when I wake up I can't post on this game until tomorrow. Also 2 more rules: when you are imagining something big (like a castle) it uses up both of your turns, and you can't imagine something gone, this is about creating, not destroying.
I imagine the ground I'm standing on levitated.
I imagine a force field that's only around me if I'm on my levitated piece of ground.
I never liked the floor. Let's build in space! I imagine a universe for all the people who want land. It has beaches and reefs and oceans and grasslands and mountains and wild roaming ands and andosaurs and ants. Also a portal to the other universe.
I imagine a space station in orbit around Cat-tania (manned by cat-men, of course) with hangars and lasers and other cool things before declaring war on Evil's nothingness and quoting the OP.
and you can't imagine something gone
You fail. Ha! I also imagine a cat-person family on Cat-tania.
I imagine that the Cat-tanians have a thriving space-age civilisation which has evolved into the Cat-tanian Federation. The Federation has a sizeable navy and begins trade with Rychusland, shortly before sending a fleet out towards Dragonia to teach them a lesson in tactics.