Sorry for not responding, Dr. Gradgrind - I haven't kept track of this thread in awhile. I do have the resurrected Orbius, if you still need it. In the meantime, here's a different creature:
Vittriss Bale CR 16
Male Green Dragon Ravener
LE Huge undead (dragon, air)
Init +0; Senses dragon senses; Perception +38
Aura cowering fear, frightful presence (210 ft., DC 25)
AC 35, touch 11, flat-footed 35 (-2 size, +24 natural, +3 deflection)
hp 196 (17d8+108)
Fort +17, Ref +11, Will +18
Defensive Abilities channel resistance +4, soul ward (18 hp); DR 10/good; Immune acid, undead traits; SR 27
Speed 40 ft., fly 200 ft. (poor), swim 40 ft.
Melee bite +27 (2d10+16/19-20), 2 claws +27 (2d6+11/19-20), 2 wings +25 (1d8+5/19-20), tail slap +25 (2d6+16/19-20)
Space 15 ft.; Reach 10 ft.
Special Attacks breath weapon (50-ft. cone, DC 25, 14d6 acid and 2 negative levels), energy drain, soul consumption, soul magic
Spell-Like Abilities (CL 21st)
At will - charm person (DC 17), entangle (DC 17), suggestion (DC 18)
Spells Known (CL 10th):
5th - cloudkill (DC 21)
4th - dimension door, confusion (DC 20)
3rd - slow (DC 19), displacement, dispel magic
2nd - resist energy, mirror image, spider climb, invisibility
1st - mage armor, shield, ray of enfeeblement (DC 17), alarm, charm person (DC 17)
0 - touch of fatigue (DC 16), open/close (DC 16), mending, read magic, arcane mark, mage hand, detect magic, prestidigitation (DC 16), message
Str 33, Dex 10, Con , Int 20, Wis 21, Cha 22
Base Atk +18; CMB +31; CMD 44 (48 vs. trip)
Feats Alertness, Cleave, Flyby Attack, Great Cleave, Hover, Improved Natural Attack (bite), Iron Will, Multiattack, Power Attack
Skills Appraise +26, Fly +13, Intimidate +35, Knowledge (arcana) +26, Knowledge (nature) +26, Perception +38, Spellcraft +26, Stealth +21, Survival +26, Swim +40, Use Magic Device +27; Racial Modifiers +8 Intimidate, +8 Perception, +8 Stealth
Languages Common, Draconic, Dwarven, Elven, Infernal, Spell Weaver
SQ trackless step, water breathing, woodland stride
Breath Weapon (Su) Vitriss Bale’s breath weapon deals 14d6 acid damage in a 50 ft. cone. In addition, it bestows 2 negative levels on all creatures in the area. A successful DC 25 Reflex save halves the damage and reduces the energy drain to 1 negative level. The save DC to remove these negative levels is equal to the breath weapon DC. Vitriss Bale adds 1 hit point to its soul ward for each negative level bestowed in this way.
Cowering Fear (Su) Any creature shaken by Vittriss Bale’s frightful presence is cowering instead of shaken for the first round of the effect, and shaken for the rest of the duration. Any creature that is frightened by his frightful presence is instead cowering for the duration.
Energy Drain (Ex) If Vittriss Bale scores a critical hit with a natural weapon, the target gains 1 negative level. The DC to remove this negative level is 25. Whenever a creature gains a negative level in this way, Vittriss Bale adds 5 points to his soul ward.
Soul Consumption (Su) When a living creature within 30 feet of Vittriss Bale dies, that creature's soul is torn from its body and pulled into his maw if the dying creature fails a DC 25 Will save. This adds a number of hit points to Vittriss Bale’s soul ward equal to the dead creature’s Hit Dice. Creatures that have their souls consumed in this manner can only be brought back to life through miracle, true resurrection, or wish.
Soul Magic (Sp) Vittriss Bale has no spell slots. Instead, whenever he wishes to cast any one of his spells known, he consumes a number of hit points from his soul ward equal to the spell slot level necessary to cast the spell. If the soul ward has insufficient hit points, Vittriss Bale cannot cast that spell. Casting a spell that reduces the soul ward to exactly 0 hit points does not harm Vittriss Bale, although he is not comfortable without this buffer of soul-energy and tries to replenish it quickly.
Soul Ward (Su) An intangible field of siphoned soul energy protects Vittriss Bale from destruction. This ward has a maximum of 36 hit points, but starts at 18. Whenever Vittriss Bale would be reduced below 1 hit point, all damage in excess of that which would reduce it to 1 hit point is instead dealt to his soul ward. If this damage reduces the soul ward to fewer than 0 hit points, Vittriss Bale is destroyed.