this post was submitted on 02 Aug 2023
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Teleportation Circles for "Portal Cannon"? (self.dnd)
submitted 1 year ago by KonaKoder to c/dnd
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I have a Big Bad Oppressive Government (BBOG) semi-inspired by the Roman Empire with the conceit that "all portals lead to Mul Khuldir," i.e., that they've figured out super-fast logistics based on a central cluster of permanent Teleportation Circles that can be connected to scroll-cast Teleportation Circles near the battlefield ( (Every warmage has Sending to coordinate and then a few Teleportation Circle scrolls to bring in the first support platoon and additional warmages). The Great Mustering Hall in the ancient Dwarven citadel of Mul Khuldir is where they've been refining the martial exploitation of portals for hundreds of year and the Magisterium of Arcana has blah-blah tried to suppress all non-government-sanctioned learning / exploitation of magic.

Anyhow, the party has now made contact with the potentially-revolutionary enslaved dwarves inside the citadel and I'm fleshing out what the defenses of the citadel might be. Since portal magic is central to the BBOG and the citadel's near a thousand years old, I've wondered if one thing you could do is: 100' vertical shaft with a permanent teleportation circle on the ceiling and floor. The floor's teleportation circle is connected to a vertical (or even pitched up) circle on the walls. You drop a rock or cannon ball down the shaft, it emerges horizontally at speed.

Thoughts?

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[–] KonaKoder 1 points 1 year ago

Thanks for that! I was going to talk about siege provisions moving through the ~~portals~~ Teleportation Circle, so good to know it's restricted on that.

Re. exploits from enemies, my idea is that there are 32 "Teleportation Circle Traps" that are isolated corridors with two permanent circles at either end, an "external" circle that is to be connected to the external environment and an "internal" circle that is connected to the Mustering Hall itself. So you have your highly disciplined troops moving at a precise jog go through an external->trap temp circle in 1 round before it closes and then mages in the Mustering Hall open another internal->trap temp circle. The thought is that if bad guys get into one of these traps, they still don't have immediate access to the citadel. (If I can figure out a good encounter for the players, I might trap them in one of these and throw in a "can be flooded" vs. maintenance tunnels or air shaftts, maybe a passage above with murder holes, etc. But if I can't do something with it, it's just going to be dungeon-dressing and its okay if it's not 100% logical.)