heres another try
CR 24
Paragon 1/2 Fiend HellcatLarge Outsider (Evil, Extraplanar, Lawful)
Str 42, Dex 40, Con 34, Int 29, Wis 29, Cha 27
8HD(64+96+96) 256Hp
Speed 120,
Fly 120'(Average)
AC 56 (base 10 -1 Size +8 Natural +15 Dex +12 Insight +12 Luck)
Attack bonus +48 (BAB 8 +16 Str -1 size +25 Luck)
Full Attack: 2 claws +48 melee (1d8+36) and bite +43 melee (2d8+28)
Space/Reach: 10 ft./5 ft.
Special Attacks: Improved grab
pounce
rake 2@+48, 1d8+28
Special Qualities: Damage reduction 10/ EPIC and good
Darkvision 60 ft.
Scent
Immunity to poison.
Resistance to acid 10, cold 10, electricity 10, and fire 10.
Spell Resistance 49
Fast Healing 20
telepathy 100 ft. +10 insight bonus on all its saving throws.
+10 competence bonus on all its skill checks.
plus one bonus feat.
natural weapons, as well as any weapons it wields, are treated as evil-aligned and lawful-aligned an EPIC for the purpose of overcoming damage reduction.
Invisible in Light (Ex): A hellcat is invisible in any area lit well enough for a human to see. In a darkened area, it shows up as a faintly glowing outline visible up to 30 feet away (60 feet if the viewer has low-light vision). Magical darkness smothers the glow and conceals the outline.
Skills: Hellcats have a +4 racial bonus on Listen and Move Silently checks.
Spell-Like Abilities: (Caster Level = 23rd)
Darkness 3/day
Desecrate
Unholy blight
Poison 3/day
Greater Dispel Magic, Haste, and See Invisibility 3/day @ 15th lvl caster