I'm a GM designing the remote fortress of an ancient-but-still-living archmage (>=20th level?). The archmage lives in society at present, and only returns to his fortress a few times per year, or as needed, via a permanent teleportation circle.

Previously, the archmage hid in this fortress for centuries to escape persecution from...well...pretty much everyone, so the fortress needs to be protected against even high-level divination magic. For this reason, I plan to line the fortress with a layer of lead and have some permanent spells like Mage's Private Sanctum, Nondetection, and similar, to prevent most/all divination magic.

At the same time, because the archmage has begun living in society again (in disguise), it makes sense that he would place some kind of alarm that would warn him, even at great distances, of intruders. Furthermore, it makes sense that he'd have a sort of permanent scrying system set up so that he alone could observe what's going on in his fortress.

(Note: The archmage's INT score is way above my own, so I figured I'd do the best I can by crowdsourcing...)

My Question

  • Is there any rules-as-written avenue for the archmage to simultaneously prevent others from successfully using divination spells on his fortress but also permit divination spells of his own?
    • If so, how could that be done?
    • If not, what might be the closest thing to it?

The Mage's Private Sanctum spell you cited does actually the job, and is probably your best solution: it makes detection impossible, thus there is no need for any alarm.

This spell ensures privacy. Anyone looking into the area from outside sees only a dark, foggy mass. Darkvision cannot penetrate it. No sounds, no matter how loud, can escape the area, so nobody can eavesdrop from outside. Those inside can see out normally.

Divination (scrying) spells cannot perceive anything within the area, and those within are immune to detect thoughts. The ward prevents speech between those inside and those outside (because it blocks sound), but it does not prevent other communication, such as a sending or message spell, or telepathic communication, such as that between a wizard and his familiar.(...)

Mage's private sanctum can be made permanent with a permanency spell.

So basically: Makes everyone inside immune to detection of any kind from outside. It can be made permanent (which is not the case of Nondetection), doesn't rely on saves, and shouldn't block your own scryings, unless you are targeting something which is also inside the sanctum. ("Divination (scrying) spells cannot perceive anything within the area" could be read as "casting a scrying spell from inside the area won't work" but I am convinced that it is not the intended reading). The limited area means the archmage may have to cast it several times, depending on its manor's size.

All the other ways to escape scrying either just make scrying more difficult (e.g. Hide-Out), or have a limited duration (e.g. Nondetection), or make the archmage have to go out of his lair to scry (e.g. Create Demiplane with the dead magic feature)

As a sidenote there is nothing such as people above the 20th level in RAW Pathfinder. The 20th is supposed to be a hard cap.

However there is a system of mythic tiers that can be used for this kind of things. If you want to insist on how powerful this archmage is you can give him tiers in the Archmage mythic path.

An Archmage with a tier of at least 3 can access Reverse Scrying, which doesn't help for what you are looking for but makes him able to return the scry to who was spying on him in the first place. Such a paranoid mage would probably take this path ability.

  • \$\begingroup\$ "20th is supposed to be a hard cap" is overstating it. The SRD does offer rules for advancement past 20th level, although it acknowledges that they aren't intended to go very far past 20th: d20pfsrd.com/classes/character-advancement \$\endgroup\$ – Geoffrey Brent Feb 9 '18 at 12:28
  • \$\begingroup\$ @GeoffreyBrent: that would apply if the question wasn't about rules-as-written. Advancement past 20th level is an optional rule and it is not part of the game by default. \$\endgroup\$ – Anne Aunyme Feb 9 '18 at 13:45
  • \$\begingroup\$ does "rules-as-written" preclude written rules that are optional, then? \$\endgroup\$ – Geoffrey Brent Feb 9 '18 at 20:17
  • \$\begingroup\$ @GeoffreyBrent: if the OP were asking "I use this set of optional rules, how does the rules work as written?" then I have to consider them in my answer. If the question is not about those optional rules I don't think I have to or it would be way too complicated to answer any r-a-w question. \$\endgroup\$ – Anne Aunyme Feb 10 '18 at 9:51
  • \$\begingroup\$ Regarding observing what's happening inside the sanctum: It doesn't prevent telepathic communication, so the wizard could have some well-concealed but living minions in the castle which tell him what's going on. \$\endgroup\$ – Philipp Feb 12 '18 at 10:19

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