Benjamin Olson
Hero
Destroying the wizard is really easy. Extended Summon Celestial (The Avenger) for 600ft range damaging. It's a flying creature, so It's immune to Meteor Swarm. It can also destroy your dungeon, destroying everything in its path, traps, objects, barriers. Good luck. In 2 hours, the creature can deal 54,000 damage to its structures and you.
Divine Soul Sorcerer level 11 destroy the wizard.
This is your ultimate Sorcerer trump card? A big cleric minion with 50 hit points whom the Sorcerer gets for an extra hour? Yeah Meteor Swarm won't solve that particular problem, but since the Wizard isn't a Sorcerer he doesn't have to solve every problem with the same limited toolbox.
This particular Wizard conquered the world, I'm pretty sure he can muster some guys on hand who can shoot a damned longbow. Or he can cast Fly on whatever minions he does have. If he is alone then he has no investment in holding his ground and should just teleport back to one of his real fortresses. Or he can summon something new to go deal with the big cleric minion, including Wish-ing in a bigger version of the exact same Celestial if he was strapped for ideas. Or he could take the most D&D player character solution of all, throw on all his best self buffs, cast Fly on himself, and go smite a Celestial personally.
Then he uses his arcane knowledge to determine what the material component for that thing was, casts locate object on the nearest 500g golden reliquary, finds the Sorcerer, and Feebleminds him so that the Sorcerer can literally drool while the Wizard rules.