The Spawning Pools are a large area composed of wide stone corridors filled with brown Tar in the southwestern region of the Underworld. This is the realm of the Reaper of the Spawning Pools and it is overrun with Terrorweb Dryders and Charged Blacknesses, two kinds of powerful elementalists. Their lethal nuking/spiking combo makes this one of the hardest areas in the Underworld.
To get to the Spawning Pools, one must head west from the Chaos Planes. the Spawning pools have no other exits.
The quest Terrorweb Queen takes place in the Spawning Pools.