my take on the winterwight:
Winterwight CR 23
820 000XP, 132.000GP
medium humanoid undead[cold]
Init +10; Senses perception 37 (darkvision 120)
Languages Moilian
Aura Cold 2d10 10ft;
Defenses
AC 40 FF 30 T 20 (10 dex 20 natural)
HP 480 (34 HD); DR 10/-; Fast Healing 10; SR 35
Immune immunity to poison;cold, undead immunities, double damage fire
Fort 16, Ref 16, Will 20
Actions
Speed 60; Leap of The Heavens; Acrobatics, Climb +47; Jump +59; teleport 50ft move action;
Melee +29/+29/+29, 3d8 + 23(19-20/x2) / Skull +24, 2d6+14; Rend 6d8+29,
Vital Strike 12d8+23(19-20/x2)
Raging Mongoose, Pouncing Strike, Stunt, on-hit Blightfire; Fort DC 23 vs.4 permanent con drain + catch fire + contagion (adjacent reflex)
warblade recovery
Base Atk 26; CMB 34, CMD 52
Statistics
Abilities Str 26, Dex 30 , Con -, Int 4, Wis 14 , Cha 14
Feats:
PF PA, imp crit claw, leap of the clouds, raging mongoose, pouncing strike, dodge, mobility, spring attack, combat expertise, whirlwind attack, vital strike line, Sudden Leap, teleport 50ft move action