Belashyrra

Belashyrra
Belashyrra is the Lord of Eyes, also known to its cultists as the All-Seer or the Glorious Eye. Stories told of Belashyrra in the Shadow Marches whisper that the Lord of Eyes can see every evil deed a person commits, and that those touched by this daelkyr suffer terrible hallucinations that inevitably drive them to violence or death.
Dreadful Visions
The madness of Belashyrra is tied to sight: images that can't be unseen, horrific hallucinations, the fear of blindness and of being watched—or realizing that something else is using your eyes. Belashyrra can force its victims to question whether what they perceive is real, or can fill their world with such terrors that they willingly blind themselves to escape.
Belashyrra sees mortals as raw materials to be exploited or insects to be exterminated. However, the Lord of Eyes has been known to take an interest in specific mortals. Belashyrra's warlocks serve as its envoys in the world and are often directed to seek out creatures and sites that the daelkyr wishes to see through their eyes.
Belashyrra's Cults
The Lord of Eyes has followers across Khorvaire, and its cults are typically driven by mad visions. Devoted cultists can grow eyes in unusual locations, and might have darkvision or other supernatural abilities when they view the world through those eyes. Beholderkin often advise or lead Belashyrra's cults, and cultists typically treat these aberrations as divine beings.
Belashyrra's Lair
Belashyrra makes its lair in the Citadel of Lidless Eyes deep in Khyber, a site that appears to have been molded from molten stone, chitin, and flesh. Across its warped and liquid expanses, thousands of eyes of every size and shape peer into the endless darkness. Beholders, dolgrims, and stranger aberrations dwell within the halls of the citadel, which is one of the few places where such creatures are willing to live side by side.
Some beholderkin serve Belashyrra as guards and agents, while others spend their lives in deep meditation, pursuing inner visions known only to the Lord of Eyes. It's rumored that anyone who sits on the citadel's throne can see through the eyes of any sentient creature on Eberron or in Khyber. If encountered in its lair, Belashyrra has a challenge rating of 23 (50,000 XP).
Madness of Belashyrra
If a creature goes mad in Belashyrra's lair or while it can see the daelkyr, it gains a form of indefinite madness. Roll on the Madness of Belashyrra table to determine the nature of this madness, which takes the form of a character flaw that lasts until cured. Chapter 8 of the Dungeon Master's Guide|DMG has more information on madness.