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"Woah! You can't just cast any spell you find laying around. You have to create a virtual world first, then cast the spell. That way if shit goes pear shaped, you just pull the plug and the world vanishes. Can you imagine if you got a grimoire labeled 'Summon Frog', but it actually summoned a plague of frogs? Do you know even who wrote the book? Bro. Virtual World."
Whoa. That is 100% my new favorite campaign setting idea. A wizard's virtual test world, with all sorts of crazy random nonsense happening, and then one day the inhabitants find out he's going to reset the virtual world.
Or just plug it into a running campaign: A wizard was using another smaller plane of existence as this, but they have somehow become unable to close it again and the party need to venture inside to fix it so he may safely close it again!
Personally, I have a dedicated realm for testing. Its an environment with a bunch of cool integrated magic I use for developing spells.
"I call it... The MicroRealm!"