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I'm playing an Abjuration Wizard. I'm currently planning & building an awesome wizard fortress using the Mighty Fortress Spell (XGtE), and all of the other semi-permanent spells I can think of. Mordenkainen's Private Sanctum, Guards and Wards, Warding Glyphs and Symbols on every wall, you get the idea.

I'm running into trouble with teleportation. I really want to have a permanent teleportation circle in my fortress - that way I can always, reliably travel there, and bring a big group with me if needed. However, I want that teleportation circle to be the only way into the fortress. All of my traps and wards do me little good if someone can simply dimension door into the middle of my fortress.

The only spells I can see that block teleportation (like Mordenkainen's Private Sanctum or Forbiddance) seem to block all teleportation effects without restriction, which would mean that I wouldn't be able to use the teleportation circle. This runs counter to my purposes as I place really high value on having that teleportation circle active. I'm looking for an effect or spell that can block most/all teleportation into my fortress, but allow me to use my circle. I'm okay with others using the circle if they know the sequence, as that will be a closely guarded secret and I can heavily trap the circle room.

Is there any way in 5e rules to limit teleportation magic in an area (in this case, a 50x50x30 foot keep) to a single teleportation circle?

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  • \$\begingroup\$ I want to clarify one moment: you want to cover WHOLE area of a fortress with anti-teleport spell, but in the same time use your magic circle as the only exception, am I correct? \$\endgroup\$ – AntiDrondert Feb 14 '18 at 11:38
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    \$\begingroup\$ @AntiDrondert Please don't answer in comments. See the relevant policy on meta. \$\endgroup\$ – SevenSidedDie Feb 14 '18 at 18:58
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    \$\begingroup\$ @RobRose Please don't answer in comments. See the relevant policy on meta. \$\endgroup\$ – SevenSidedDie Feb 14 '18 at 18:58
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    \$\begingroup\$ @Dacromir Please edit any clarifications into your question before the remaining comments are deleted. Thanks! \$\endgroup\$ – SevenSidedDie Feb 14 '18 at 18:58
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    \$\begingroup\$ Dacromir, I have cut and pasted your comment into the bottom of your question. That's the kind of thing Seven Sided Die is asking you to do. Comments eventually go away. \$\endgroup\$ – KorvinStarmast Feb 14 '18 at 19:44
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Forbiddance

You create a ward against magical travel that protects up to 40,000 square feet of floor space to a height of 30 feet above the floor. For the Duration, creatures can't Teleport into the area or use portals, such as those created by the gate spell, to enter the area. The spell proofs the area against Planar Travel, and therefore prevents creatures from accessing the area by way of the Astral Plane, Ethereal Plane, Feywild, Shadowfell, or the Plane Shift spell.

Spell description doesn't specify the figure of the warded area, so we can assume we can shape it as we want. Red squares are (your teleportation circle area, 5x5x10 area) excluded from warded zone. The only way enemies can teleport in is to know the exact location of teleportation circle within the fortress. You can ward you fortress as following:
enter image description here
enter image description here

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  • \$\begingroup\$ This is the answer I needed. The key difference between Forbiddance and Mordenkainen's Private Sanctum is that Sanctum just affects a cube, but Forbiddance allows you to shape the area however you want, but I didn't realize that. Casting Forbiddance on every part of the fortress except the room with a teleportation circle will accomplish more or less exactly what I'm looking for. \$\endgroup\$ – Dacromir Feb 14 '18 at 23:49
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    \$\begingroup\$ @Dacromir Thanks for accepting, but my answer is just an illistration of Slagmoth answer, tick it instead, if possible. \$\endgroup\$ – AntiDrondert Feb 15 '18 at 6:44
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    \$\begingroup\$ I'm not saying you are wrong but "Spell description doesn't specify the figure of the warded area, so we can assume we can shape it as we want." is not clear that it would allow the area to be shaped. You may want to add some additional logic there. \$\endgroup\$ – Rubiksmoose Feb 16 '18 at 15:27
  • \$\begingroup\$ This is confusing for a number of reasons, not the least of which is dispelling. I will link you to an answer I did recently explaining these. \$\endgroup\$ – SeraphsWrath Feb 16 '18 at 19:25
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My Bladesinger was in really good standing with the local temple to St Cuthbert, having retrieved the body of their high priest and saved the temple from being overrun with slaads. So I had one of their clerics cast Forbiddance until it became permanent. I also used Modify Memory to remove all memory of them doing so, that way only I knew the password.

When you cast this spell, you can designate a password. A creature that speaks the password as it enters the area takes no damage from the spell.

Keep in mind that you could also have the area of the Sanctum and Forbiddance spells NOT include your place for the Teleportation Circle. AntiDrondert provided a grid to illustrate what I posited here.

My Bladesinger has a room at the lowest level with his Teleportation Circle. If you created this "Keep" (I use quotes because the dimensions seem really small to have it called that) with another spell, once it is permanent there is nothing preventing "Home Improvement Projects" to excavate underneath or add on to it. This would include a special room like I have with extra wards to get beyond the room you enter with the Teleportation Circle. For me this includes summoned guards as well as things like mechanical and magical traps and wards. If you step in the wrong place or don't use the correct password you don't get very far beyond my circle. This all assumes you even can get the proper sequence since only he knows it in the first place.

One additional thing is that your DM might allow you to combine the effects of the password with the sequence of the circle so that without the additional glyph you can't get through. This would be a house rule but would be in keeping in line with balancing spells. It might require additional research and/or questing for the way to do such a thing. Or researching a version of Private Sanctum to allow for passwords or extra glyphs to allow passage for those that know it.

Forbiddance has the interesting verbiage to seem as though you can teleport out but not in, whereas Private Sanctum specifically calls out both ways. Something to consider.

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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – mxyzplk Feb 16 '18 at 17:42
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Place your circle on the roof.

Your roof is already vulnverable in the same way your front door is. The only things stopping people from flying up there and gaining entrance are the traps and wards you have placed on whatever entrance you decide to put up there.

Don't have private sanctum cover the roof, teleportation circle is in the roof, teleport in (or land your magic carpet, Apache copter, etc.), disable traps and wards, and walk in.

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    \$\begingroup\$ “…Apache copter …”: I just wanted to check that you're aware this is a D&D question? \$\endgroup\$ – SevenSidedDie Feb 14 '18 at 18:55
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    \$\begingroup\$ @SevenSidedDie I suspect that was for humorous intent, or the answerer plays in Ebberon ... \$\endgroup\$ – KorvinStarmast Feb 14 '18 at 19:45
  • \$\begingroup\$ I thought of the Modern Magic Unearthed Arcana article myself. I'm unsure if there are Apache 'copters in there or not though. \$\endgroup\$ – M C Feb 14 '18 at 19:48

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