Lunia

The first layer of Mount Olympus is the most accessible. Lunia is known as the Silver Heaven, and this is where portals and gates from outside the plane lead travelers before they can ascend to higher layers. The sky is midnight blue but dotted with bright twinkling stars, and the lantern archons believe each star is actually a soul that has ascended to the highest peak of the Seven Heavens.
Lunia is unique among the layers of Mount Olympus for several reasons. It is largely made up of a vast wine-dark gulf known as the Silver Sea, through which swim all manner of creatures, celestial and mundane. The waters are naturally blessed and from them rise numerous pillars of natural alabaster stone. Countless creatures have built strongholds and citadels upon these stone pillars, though the most famous are the Beacon Towers, occupied by lantern archons on the lookout for invasion forces from the Lower Planes.
Beyond the shore of the Silver Sea, Lunia’s terrain is more hills and shallow valleys than rough peaks like the higher layers. The stars overhead bathe Lunia in glorious starlight so the darkness is never a bother, and everything is well-lit.

Geography

Zephrah by Kent Davis

Bastion of The Fallen Angel

There are few more cursed places in Mount Olympus than the Bastion of the Fallen Angel. Located in a shadowed valley up the slope on Lunia, this was the former home of Zariel, an angel (solar) that betrayed the gods to join Asmodeus in his infernal plane. In love with the lord of the Seven Hells, zariel betrayed her kind, and created a rift leading directly to Luxuria, the first layer of hell that she now lead.
Zariel’s fortress immediately fell into disrepair, yet the rift, this portal to Luxuria stills and in the shattered ruins. Those left behind at the Bastion of the Fallen Angel abandoned the fortress immediately upon Zariel’s betrayal. Now, it is a haunted place, where the memories of the once proud warriors that guarded its battlement and patrolled its grounds walk in shadow. Few have sought it out, and most of those that have discovered the mountain trails actively discourage visitors.

Blind Prison

There are some among the celestial residents of the Seven Heavens that believe rehabilitation is a possible route for some evil creatures. Bahamut, the platinum dragon, saw the wisdom in the attempt, and constructed a fantastic fortress known as the Blind Prison on the shores of the Silver Sea on Lunia.

All prisoners brought to the Blind Prison are magically blinded by a special binding cloth of radiant energy and marked with the crest of the prison. They are kept in individual cells within the sprawling fortress complex and watched over at all times by a retinue of lantern and warden archons. A catalogue of all prisoners, their crimes, their sentences, and any notable behaviors is kept in a massive golden tome called the Codex Caecus. To date, the efforts to rehabilitate a prisoner within the Blind Prison has not been successful.
There are cells deep beneath the Blind Prison where monstrous creatures are kept that are too powerful to be destroyed. Rehabilitation is not the goal for these abominations, only containment.