What ways are there to prevent teleportation?

[ppaladin123]

swordmage guards with this utility stance:

Dimensional Warding Swordmage Utility 6
Your warding warps the flow of magic around you, preventing
enemies from sneaky escapes or attacks.
Daily ✦ Arcane, Stance, Zone
Minor Action Close burst 2
Effect: The burst creates a zone that lasts as long as the
stance persists. Enemies within the zone cannot teleport.
Enemies outside the zone cannot teleport into it.
Special: The zone remains centered on you, even if you move.

 

[Amphimir Míriel]

I know this is probably not very helpful, but I have decreed that, in my world, cast iron (not steel) disrupts most teleporting powers (but not rituals).

So a simple and cheap iron gate prevents an Eladrin from teleporting out, however pure iron is brittle and easily broken, so people wanting to prevent teleporting intruders do well to alternate iron portcullises with heavy oaken doors and good-old-fashioned moats

 

[tgaptte]

I don't need to hose them, but I do want to take them into account. I'd feel pretty foolish if I design my impregnable fortress (with 10' walls) and someone uses their armor of breaching to stroll inside.

Good stuff here.

Just make sure your walls "go to 11"

 

[IceFractal]

Well, most teleport powers require line of sight, and the rituals (pre-epic) require a target circle. So the only things you have to worry about are:
A) Wall-passing stuff like Breaching Armor.
B) That one Warlock power that doesn't require line of sight.

A low-cost solution I used in 3E, which should work against breaching armor as well, is to use non-solid walls. For every 1-2 feet of wall thickness, have a 1" gap. Things targetting a part of the "wall" - like Disintegrate, Passwall, and so forth - only get you through one layer.

For bonus points, make your layers out of different materials (alternating stone and iron, for instance), and put unpleasant things (poison gas, swarms of undead bugs, etc) between them.

As for the Warlock power, it only gets one person in, so just make sure you have sufficient guards inside that one intruder can't open the gates.

 

[Victim]

Most teleport powers require line of sight - IIRC, the only PHB teleport that doesn't is the level 10 daily Warlock's Leap.

So the fortress should be designed to make sure outsiders can't readily see inside of it.

 

[Kraydak]

For the level range given, it doesn't seem like there is a major issue.

I do think that any major (or even minor) fortress is going to want a teleport circle. It is sort of like a needing a front gate: the utility of being able to move to and from your fortress under siege is worth the extra effort of fortifying the teleport circle room. And, of course, said teleport circle room will be heavily fortified, much like the main gate.

Now, if your slightly egocentric/paranoiac castle-wizard decides to up and make his own teleport circle in secret (because he is too important to bother/doesn't want anyone watching him travel), then you have a problem. Or, from the PC's POV, probably an opportunity. While the existence of such an illicit circle does have something of the feel of a deus ex, it also feels very... human, which makes it quite excusable.

 

[Shadeus]

Honestly, I'd let them teleport in. Nothing is more frustrating for a player who has designed their character to be an infilitrator to hear "Sorry, you just can't teleport in."

I remember back in the days of that horribly broken 2E module, Labrynth of Madness, if you used passwall on a wall, there were spectres that lived in the wall that you unleashed. You might consider modifying that idea to your liking. What I mean is maybe there are spirits or elementals that live in the walls and can sense teleportation. Maybe they just tag along and can attack.

And speaking of Passwall, with it being a level 12 ritual, that's a viable option here too with the levels you have given. The "spirits in the wall" gig could take care of that too.

The advantage it offers is that the PCs are successful; they got in. But they also have a fight on their hands, and maybe one they weren't ready for. The spirits shouldn't care about alerting whoever lives there, just that someone has magically "violated" their castle.

I'd be careful about a wholesale Forbiddence at levels 10-14. If this was an epic castle, I'd say go for it. But pulling out a ritual that's at least 6 levels higher level than the party is a little rough.

 

[Mustrum_Ridcully]

I don't need to hose them, but I do want to take them into account. I'd feel pretty foolish if I design my impregnable fortress (with 10' walls) and someone uses their armor of breaching to stroll inside.

Good stuff here.

Note that not all PCs will be equipped with the Armor of Breaching per default. So, getting one to the other side can be useful, but might not be overpowered (and sometimes be dangerous to the "breacher").

If the PCs really ensure that they get these armor of breachings for every PC - then let them. They apparently made a plan and prepared it.
Unless you absolutely do not want anyone to get into the building ever. But then you have to take into account them using "traditional" methods to break through the wall, too.

 

[Roger]

I'm trying to figure out how "infiltration-proof" a fortress can be.

I'd be more worried about Phasing, and to a lesser extent, Burrow.

Assuming I'd worry about such things at all, which I probably wouldn't.



Cheers,
Roger

 

[James McMurray]

Most teleportation that can get you into a fortress is going to kill the teleporter, or at least put him in harm's way. The only group teleportation at that level is Arcane Gate (needs line of sight) and Teleportation Circle (needs a known circle to target). Instead of banning it, what about taking a page out of Monte Cooke's design repetoire and bringing it in as a non-necessary, but highly useful, means of entering the place.

Teleport Circle: It's likely that the fortress would want a circle of its own, and unlikely that the PCs would know anything about it. Don't mention it in flavor text anywhere, but prep a skill challenge for the party to do should they come up with the idea on their own. Success means they find the circle somewhere, and get to bypass the larger force of gate guards but still have to contendwith the teleportation room itself (traps and/or guards). Failure means they don't find it, and have to contend with the harder front gate.

Arcane Gate: forbiddence or making the fortress a giant dome / underground vault are the easiest ways to stop this, but if the only spots that can easily be seen from the ground are guarded or trapped, it can allow for a third entryway that creates more challenges instead of closing doors.

The rest of the teleports can be left up to each individual GM to dela with. Warlock's Leap and Breaching Armor are great, but it's a bad idea unless everyone can do it.

In my epic game I've avoided "no teleport" zones almost completely. The only time I used it was in a trap, where the PCs were split by falling portculli and then surrounded by artillery and minions. The area of the trap itself did not allow teleportation, but everywhere else did. That way it was only that one encounter that shut down a large portion of the warlock's abilities, and the rest of the adventure he was free to bamf all over the place.