Had a bit of time over the weekend, so here's my take on the spectre (from the Immortals Set).
[FONT=20 size=3D4]Mystaran Gargantuan - Spectre[/FONT]
Gargantuan Undead (Incorporeal)
Hit Dice: 56d12 (382 hp)
Initiative: +14
Speed: 80 ft. (16 squares), fly 160 ft. (perfect)
Armor Class: 18 (+6 Dex, +6 Deflection, -4 size), touch 18, flat-footed 12
Base Attack/Grapple: +28/--
Attack: Incorporeal touch +35 melee (4d8 plus energy drain/19-20)
Full Attack: Incorporeal touch +35 melee (4d8 plus energy drain/19-20)
Space/Reach: 20 ft./20 ft.
Special Attacks: Energy drain, create spawn
Special Qualities: Darkvision 60 ft., incorporeal traits, +4 turn resistance, sunlight powerlessness, undead traits, unnatural aura
Saves: Fort +18, Ref +24, Will +30
Abilities: Str --, Dex 22, Con --, Int 14, Wis 14, Cha 22
Skills: Hide +53, Intimidate +65, Knowledge (religion) +61, Listen +63, Search +61, Spot +63, Survival +2 (+4 following tracks)
Feats: Alertness, Blind-Fight, Combat Expertise, Combat Reflexes, Dodge, Flyby Attack, Improved Critical (touch), Improved Flyby Attack, Improved Initiative, Mobility, Toughness(x7), Weapon Focus (touch)
Epic Feats: Superior Initiative
Environment: Any land or underground
Organisation: Solitary or gang (1 plus 1-10 spectres)
Challenge Rating: 24
Treasure: None
Alignment: Always lawful evil
Advancement: 57-84 HD (Gargantuan), 85-112 HD (Colossal)
Level Adjustment: ---
A massive, faintly luminous, ghostly humanoid swoops quickly towards you.
COMBAT
In close combat a spectre attacks with its numbing, life-draining touch. It makes full use of its incorporeal nature, moving through walls, ceilings, and floors as it attacks.
Energy Drain (Su): Living creatures hit by a gargantuan spectre's incorporeal touch attack gain 2 negative levels. The DC is 44 for the Fortitude save to remove a negative level. The save DC is Charisma-based. For each such negative level bestowed, the gargantuan spectre gains 5 temporary hit points.
Create Spawn (Su): Any humanoid slain by a gargantuan spectre becomes a (normal) spectre in 1d4 rounds. Spawn are under the command of the gargantuan spectre that created them and remain enslaved until its death. They do not possess any of the abilities thay had in life.
Unnatural Aura (Su): Animals, whether wild or domesticated, can sense the unnatural presence of a gargantuan spectre at a distance of 120 feet. They do not willingly approach nearer than that and panic if forced to do so; they remain paniced as long as they are within that range.
Sunlight Powerlessness (Ex): Spectres are powerless in natural sunlight (not merely a daylight spell) and flee from it. A spectre caught in sunlight cannot attack and can only take a single move or attack action in a round.
A few points:
1. Being an incorporeal undead obviously effected the template (no Str, Con, or natural armor increases) - as compensation I split the Ability increases (due to the additional HD) between Dex and Cha. I also kept it's perfect flight ability rather than reducing it to clumsy.
2. I upped its turn resistance to +4
3. I was tempted to up its Energy Drain to 4 negative levels until I calculated the Fortitude DC!
4. The version in my campaign has the following (non SRD) feats from Libris Mortis - Daunting Presence, Baleful Moan, Improved Energy Drain, Improved Toughness, Improved Turn Resistance, Life Drain, and Positive Energy Resistance. They replace the following feats from the stat block - Toughness(x7) [maybe add as a sidebar - 'if you have Libris Mortis...']
5. CR 24 seems rather low!!!
Regards
Mortis