Celest Val, the Divine Mountain.

A mountain in the midst of the Illithis mountains, Celest Val was the base of the gods as they created the world, now it serves as their meeting hall.  Normally, no mortal is allowed to enter, the hall is guarded by Belidon the Uncorupt, an immortal paladin, and servant to Ardin, but exceptions are made during, emergency meetings and Neasratide annual councils,  Brotherhood of Adirus, the Sisterhood of Naltirinen, the Order of Tyron, and other divine disciples are permitted.  Celest Val is on of the tallest mountains in the world, it's peak is forever covered in ice and snow and shrouded in clouds, the mountain itself is mostly open rock, except at the very bottom, where there are a few trees.  The meeting hall, as described by Serentus when he first went inside was, "And the hall itself was gilded in gold, the many pillars against the wall were covered in silver, diamonds, zircons, and pearls, so the whole hall, when lit by torches, glowed much like a sun. The whole hall measured 50 cubits.  The floor was polished marble, of the whitest kind, which reflected the ceiling, which was an accurate map of the nighttime sky, though it was much more like the starry sky than just a painting.  The great, polished oak table, which covered most of the hall, has a great throne for every of the 20 deities, and a great, silver, mithral, and moonstone throne at the northern head of the table for Ardin, Creator of All."  When Hadmodeus fell, and gave up his immortality, he was not permitted to enter or step foot on Celest Val, his followers, and the Necromancer of the Sacred Skull.