He doesn't need to. I suppose the goal to defeat to the sorcerer include at least the idea the the Hovering Holed Up Target exist, or are you saying the the Wizard can't defeat any level 1 commoner simply because they don't care enough to even hear of them?
You didn't clarify your use of the Private Sanctum. If it is only when Target is sleeping, then there is nothing that prevent Scrying (Scry doesn't need to know the scried party, it's possible to scry having only heard of the target, it only increases the DC of the Wisdom saving throw by 5) and, given enough time, of which we don't lack, at some point the Scrying will get cast when the sorcerer is entering of leaving his sanctum. Then, the Wizard will have seen the place, which is enough for the spells discussed upthread.
It can, unless they are flying above 40 ft all the time. It's because you established that you were flying all the time that we had to discuss the sleeping habits and you elaborated that your Holed Up Target never leave his Sanctum.
You can always see just outside the foggied area. The sphere is centered on the ground you see, but doesn't vanish above the ground you can't see. The exact wording is : "Blazing orbs of fire plummet to the ground at four different points you can see within range. Each creature in a 40-foot-radius sphere centered on each point you choose must make a Dexterity saving throw." The sphere is centered on a point you can see (just outside the border of the Private Sanctum) and extend inside it. Can I understand your answer as confirming that you establish that you are never ever leaving not only the Private Sanctum but the area of the Private Sanctum closer to the border of the Sanctum than 40 feet)? That's what, 20ft by 20ft? It's even less than mum's basement, especially to fit two large creatures, the Sorcerer, his Simulacrum and 60 magen.
[If anyone can do the math by head to calculate the exact area, I'd be interested to know the exact living area of Holed Up Target].
As you'd need to expand on both dimensions to be sure you are farther than 40ft feet and keep some breathing space, you'd need to upcast Private Sanctum at least to 6th level. As you have to Wish for it (Private Sanctum isn't on your known spell list) and wishing for an upcast version of a spell effect, while very reasonable, isn't RAW and is disqualified on the ground of "no DM help me" rule your instated. However, given the sore state fo the life of the Holed Up Target, I petition your DM for leniency so he could allow your 200x200ft Private Sanctum to be created at the expense of your daily 9th level slot.
If... your Sorcerer seems very ill-armed to mount a counter-attack as most of his limited spellcasting repertoire consists of preparing to survive (just look at how much the poor sod need to do to avoid just the DAY 1 strategy, the Meteor Swarm Alpha Strike led by a Simulacrum)... He has no information gathering spells and nor ability to travel to the place from where the wizard is planning the attacks.
So far, he hasn't really started. You just elaborated some facts on the daily routing of the Holed Up Target that we needed to know to present a strategy. Before you established those fact, we couldn't know that your Sorceror is never leaving his 200 by 200 ft Private Sanctum, countaining the Magen retinue that can't see outside as well, and hovering above 40 ft above the ground all day inside his Sanctum, and that the Sorcerer is spending his daily 9th level slot to get said Sanctum! And that's just a few fact that were established when we discussed the possibilty of Meteor Swarm. (TBH, on Day 1, the Wizard could still do a Meteor Swarm Alpha Strike led by the Simulacrum, because it's fun to cast Meteor Swarm and he could wipe a few Magen [after all, he can't be certain that they are all holed up in the center area of the Private Sanctum, so let's be sure and meter to death a few Magen just in case. I grant you that your preparations will get him NO MAGEN DOWN, but he has a closer idea of how the Holed Up Target is behaving.
