The Devourer of Dreams

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 * type        = Evil Outsider
 * race        = Quori
 * alignment   = Chaotic Evil
 * level       = ?/?/?
 * named       = yes
 * boss        = Red named end boss
 * attack      =
 * Bludgeoning melee damage, 30-50 on elite, attacks fairly slow
 * Greater Shout?
 * Special blasting attack (same animation as a Cinderspawns), deals ~150 force damage, stuns for a few second (Monk Grasp of the Earth Dragon buff works)
 * qualities   =
 * DR 10/ Crystal and Good
 * Health Regeneration (see below)
 * Fire/Acid/Cold resistance, but is not immune to any of them, around 100/150/200 points on Normal/Hard/Elite
 * No Lightning resistance, so Lightning Strike weapons tend to be ideal
 * Quori Mind (Immune to fear, charm and sleep)
 * Spell Resistance
 * habitat     = Plane of Nightmares
 * description = The Devourer of Dreams is the leader of the Circle of Night, an elite organization within the Dreaming Dark. Also known as "The Dreamer", the powerful psionic has the ability to commune with the spirits on Dal Quor without being utterly destroyed or absorbed. These spirits guide the Devourer of Dreams' motives which he then in turn distributes to the other agents of the Dreaming Dark.

Regeneration
Attacking him with effects that deal good-based damage (Deific Vengeance, Holy Smite, Weapon Prefix: Holy, Weapon Suffix: Pure Good) will cause the Devourer of Dreams to go "Vulnerable" for a short period of time. This will negate his regeneration.

Motivation of this design likely is to prevent this fight to be solo'ed by casters easily.

The Nightmares
There are only 3 total spawn, and they never respawn. They seem to be linked to the Devourers current health: First one at ~90%, 2nd at ~60%, last at ~30%.

They seem to be some sort of Living Spell (Type:Ooze and Race:Violet Slime). They have an anti-healing aura and cast some sort of irresistible force damage spell (around 100 damage). So you cannot heal nor repair while they are within a few feet of you. You will need to draw them away from your main group. They are really not too difficult to kill but you can just kite them until the boss dies, they disappear once the fight is over.

Source
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 * http://forums.ddo.com/showthread.php?t=226897