Hohige
Explorer
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In many of the answers you postulate that the attacking wizard is dead, even when it's a simulacrum of his that leads the attack. This specific counter-attack will have to be established later, once all of the facts about the setup will have been clarified.
Granted, but discerning the location of the building where Hovering Target is dissimulated is still possible. There is no need to know the exact location of the target for some of the plans that have been proposed.
On the other hand, you earlier alluded that it was possible to attack the Sorcerer outside of his defenses constructed over many years. I am not sure it is already the case since you're bringing up Private Sanctum after Mighty Fortress and Temple of Gods. Because if the sorcerer is always inside a private sanctum, I'll call him the Hovering Holed Up Target : a 4th level spell slot, is needed to shroud a 100 feet long area for 24 hours. Even if the sorcerer uses all its 4th level and above spell slots on it, he gets 12 casting of it. He could also uses Sorcery Points to get more castings per day, but he'd use all his magical power to create a 5000 feet long (1.5 km) corridor every 24h. That's not a lot of distance covered each day for the ability to advance hidden at the cost of all the spellcasting ability. So, if this is the case, please confirm.
If this is not the case, there is no reason to assume the Wizard 20 will wait for the Sorcerer to be inside his Private Sanctum to engage his strike. He'll simply wait for the Hovering Holed Up Target to actually try do something useful and leave his Sanctum.
If you're trying to say that the Hovering Holed Up Target will sleep inside his Mighty Fortress or inside his Temple of the Gods just after having cast Private Sanctum, please clarify that as well.
I see that you are trying to use RAW against all common sense again. It is obvious that the intent of the spell isn't to prevent people for determining where to point their finger at... The area of the Meteor Swarm blast is 4 spheres of 40 ft radius. Even striking the sides of your private sanctum will be enough to reach most of your creatures as half the blast area will be inside your sanctum... including 40 feet toward the center of Sanctum, from each side. Even an even distribution of your Magen among the area will make you lose many of them on day one, without any possibilty of retaliation, as your magen army have their sight blocked across the boundary of the Private Sanctum, so they can't search for the invisible Wizard 20 simulacrum hovering in the sky above, even if they could somehow do that in the first place. Do you envision the Sorcerer sitting in the rather small "safe area" more than 40 ft from any border of the private sanctum inside the 100 ft square? Can we establish this as a fact as its your protection against Meteor Swarm Alpha Strike?
Plus, you might want to correct the spell known list in the original post, which doesn't feature Private Sanctum, unless you must establish that the Sorcerers Wishes for it every day as well?
Not really, as the Magen can't see outside of the Private Sanctum because someone cast this spell just so "the barrier of the warded area appears dark and foggy, preventing vision (including darkvision) through it." There is nearly no risk to wander outside the Private Sanctum as the Magens don't have any other sense than regular sight.
The Wizard does not know who his target is.
The Wizard cannot know where the Hidden Fortness is.
Meteor Swarm cannot affect any flying creatures.
You need "Ground you see" to cast Meteor Swarm, which means is useless.
Private Sanctum "So you could protect a cube that can be up to 200 feet on one side by using a spell slot of 5th Level."
This Wizard is nothing, just another victim that if the Sorcerer finds him, he will die like anyone else.
Everything failed for the Wizard, unfortunately.