You want BIG bad evil guy, right? I'll start with a Great Wyrm Red Dragon, and work from there.
Rashkellan, the Ravager of Dreams
Collosal Dragon
Hit Dice: 40d12+400 ( 660 hp)
Initiative: +6
Speed: 40 ft.
Armor Class: 42 (-8 size, +0 Dex, + 40 natural), touch 2, FF 42
Base Attack/Grapple: +40/+73
Attack: Bite +50 melee (4d8+17) 2 claws +45 melee (4d6+9), Tail slap +39 melee (4d6+9)
Space/Reach: 30 ft./20 ft.
Special Attacks: Dream powers, Spells
Special Qualities: Darkvision 120 ft, blind sense 60 ft
Saves: Fort +32, Ref +22, Will +30
Abilities: Str 45, Dex 10, Con 31, Int 26, Wis 27, Cha 26
Skills: Listen +40, Spot +40, Sneak +40, 490 skill points left, no more than 43 ranks each
Feats: Improved init, Tough hide, Psion, Weapon Focus (claws & bite), Weapon Specialization
(claws and bite), Modify Spell, 6 more feats left
Environment: Dreamscapes only
Organization: Unique
Rashkellan is a Great Wyrm, who lived his physical life in the ages before the Dramojh. His
experiements led him into the area of controlling mortal beings through dreams, rather than physical domination. As his brethren were forging flesh into Dramojh and other Aberrations, he was bending the minds of lesser creatures to his will. His culmination of life's work occurred right before the beginning of the end for his kind; while his brethren were being destroyed, and the Dramojh went into hiding to plan their domination of Terrakal, he delved the depths of his knowledge, learning all there was to know about control of dreams, and the dreamers who visited his new realm.
He staged a brief attempt to dominate key Dramojh some several hundred years later, but the Dramojh were craftier than their Dragon sires, and managed to subjugate Rasjkellan and encase him in the Orb of Dreams, whereupon it was fought over, passing from one Demon-Dragon master to another, each one trying to use its power in their schemes, until the end came for the Dramojh - and the item lost.
Rashkellen now has complete Mastery of his abilities, and has by force of will increased his stature and image of himself to near-godhood - or as near to Godhood as a dragon can conceive,
that of a Great Wyrm Red Dragon. He no longer physically exists, but has complete control both over his form, and near-complete control of those around him in the dreamscape.
His power is immense, but because of this he is self-assured, and should a dreamer more powerful than he show up, his arrogance and underestimation could be his downfall.
Magic use: Rashkellan is the equivalent of a 13th level Magister, but who does not require a staff for his spells.
Dream Dominance Aura: Rashkellan can focus his attention on any area in the material plane, in an area of effect approximately 1 mile wide. All within the area will have horrible nightmares while sleeping, requiring a Will save (DC 20) to attain a restful night's sleep. Among the populace within the area, within 72 hours, irritability sets in; within 14 days, delusions occur to all the populace within the area. Any single person in this area may be singled out, and their subjective reality controlled as if by a Wish spell. Anyone killed in the dreams must make a Fortitude Save (DC 15); those who fail the save immediately start dying, going to the "dying" number for them, and losing 1 hit point per round until dead, or until healing attention is given.
Sleep Gaze (Su): When Rashkellan wishes, he can activate a gaze attack on any sleeper with a range of 60 feet. It puts that creatuer to "sleep" for 8 hours, unless they succeed at a Will save (DC 32).
Dream Tracking (Su): If Rashkellan knows a character’s name, he can attempt to discern that character’s location anywhere in the world. The only limitations are that the character must be asleep when he makes the attempt and must fail a Will saving throw (DC 32). Effects that block divinations also block this divinatory ability. If Rashkellan knows a character’s truename, no saving throw is allowed.
Sense Dreamer (Su): Even if the dream hunter has no special knowledge or connection to a creature, it can sense a sleeping creature within 250 feet at will, discerning its exact location. Effects that block divinations also block this divinatory ability.
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Hopefully this will give you a start; anyone can feel free to tweak this as they see fit!
