Izzel originally built this as part of a larger structure in their research into summoning forth the many alchemical salts of the yellow hells – but at some point everything went wrong. The surface structures are all destroyed and all that remains are these underground areas which were once painted in all imaginable shades of yellow, but which are now a pale blue-grey (and occasionally green-grey where the brightest yellows still cling).
The structures down here include a variety of pseudo-temples (to contact the residents of the yellow hells), strange metamagical machineries, workspaces, grand halls, secret chambers, and even a chamber completely divorced from the rest of the structure, only reachable through passwall, teleportation, and similar magics.
And of course, many foul little demonic beasts.
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(Source: Dyson’s Dodecahedron)