Wednesday, March 11, 2026

The Vacuum Swamp

A while back I was talking about meaningful choices and referred to uninformed decisions as vacuum swamps, in that they are the perfect habitat for a quantum ogre. Here is that idea made manifest.

Vacuum Swamp

The vacuum swamp exists along whichever path the players choose. Their choice never mattered, you were always going to use this. You spent all that time preparing it and your players will love it.

When your players pick a path to travel or a door to enter, there is a 1% chance that it leads to the vacuum swamp instead of its natural destination. The vacuum swamp is a small demiplane consisting of an oozy swamp with a rickety wooden shack. If you entered the swamp through a door, you exit from the shack and the door is your only way back. If you entered along a path, this shack's door can lead to any other door (Judge's choice).

The ooze is green and bubbling. The bubbles float a few feet up into the air before imploding with a loud crack. Will o' wisps and other creatures which lead travelers off the path are common here. Straying too far from the path will lead to the edge of the demiplanar boundary - whether this leads to an empty space, a magical barrier, or the astral plane depends on established cosmology and is up to the Judge's discretion. The Judge may always roll a d3 to decide: (1) vacuum, (2) magical barrier, (3) astral plane.

If the players enter a vacuum swamp, they are guaranteed to encounter a quantum ogre.

Quantum Ogre

The quantum ogre occupies any number of spaces in the world at once, becoming tangible and real the moment it is observed. Until such a time, it is impossible to determine the true state or position of the quantum ogre.

Its natural habitat is the vacuum swamp. In a vacuum swamp, quantum ogres can materialize spontaneously.

Initiative: +2;
Attack: slam +5 melee (1d6+6) or great mace +5 melee (1d8+6);
AC: 17; HD: 6d8+4 (32 HP);
Movement: 20', Action Dice: 1d20 per duplicate (see quantum superposition);
Special: quantum entanglement, quantum superposition;
Alignment: Chaotic;
Saves: Fort +4, Ref +2, Will +1;

Quantum superposition: There is one duplicate ogre for each creature the quantum ogre is fighting, all sharing the same HP pool. They make their moves on the same initiative rank in any order they choose but no two can attack the same target in the same round. If any duplicate ogre successfully lands an attack or performs some other interaction with the world, the waveform collapses and that ogre becomes real while other duplicates become unreal. The real ogre is the one that must be attacked in order for the quantum ogre to take damage.

Attacks and spells against an unreal ogre are ineffective but make it become the real ogre.

Quantum entanglement: If the quantum ogre deals damage to a creature, it can automatically deal the same amount of damage to another creature that one of its duplicates is within striking range of. This duplicate does not become the real ogre.

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