A windowless tower of several floors connected through by a spiral stairwell. Floors include:
- Barracks A
- Barracks B
- Barracks C
- Training floor with sparring area
- Mallory’s office
- Cassandra’s lab, where the Breach occurred, now sealed with karach
- Kitchen level
- Evidence locker, where Mary Reed was caught rummaging
- Bottom floor with teleportation circle, and sealed double doors out to an unknown location

Chronicle
Case 02e02
SPI agents returned to headquarters for debriefing and to obtain supplies for dealing with petrification threats.
Case 09e01
The SPI’s headquarters which the party discovered in the crystalline flux realm while riding the Yachtopus.
Case 10e05
Found to be corrupted by a demiplane of earth and besieged by demonic forces including a nightmare tree.
Case 12e01
Suffered a break-in; the Arkenstab was stolen and the crystalline flux rift was mysteriously repaired with karach.
Case 14e00
Mentioned as being mostly repaired; used as the agents’ base of operations.
Case 16e01
SPI discovered an otherworldly chamber beneath their headquarters where reality and the Flux converge, protected by an invisible forcefield that permits only those with Flux affinity to pass freely.
Case 16e09
The trapdoor to the Flux chamber beneath SPI HQ sealed itself after agents returned; only a faint spiritual whooshing remains detectable from within the now-inaccessible chamber.