Naga, Spirit (CR 9)

Large Aberration
Alignment: Usually chaotic evil
Initiative: +1 (Dex); Senses: darkvision 60 ft., Listen +14, and Spot +14

AC: 16 (-1 size, +1 Dex, +6 natural), touch 10, flat-footed 15
Hit Dice: 9d8+36 (76 hp)
Fort +7, Ref +6, Will +9
Speed: 40 ft.
Space: 10 ft./5 ft.
Base Attack +6; Grapple +14
Attack: Bite +9 melee
Full Attack: Bite +9 melee
Damage: Bite 2d6+6 and poison
Special Attacks/Actions: Poison, charming gaze, spells
Abilities: Str 18, Dex 13, Con 18, Int 12, Wis 17, Cha 17
Special Qualities: -
Feats: Ability Focus (charming gaze); Alertness; Combat Casting; Eschew Materials; Lightning Reflexes
Skills: Concentration +13, Listen +14, Spellcraft +10, and Spot +14
Advancement: 10-13 HD (Large); 14-27 HD (Huge)
Climate/Terrain: Temperate marshes
Organization: Solitary or nest (2-4)
Treasure/Possessions: Standard

Source: Monster Manual

Poison (Ex): Bite, Fortitude save (DC 18); initial and secondary damage 1d8 temporary Constitution.

Charming Gaze (Su): As charm person, 30 feet, Will save (DC 17).

Spells: Spirit nagas cast spells as 7th-level sorcerers, and can also cast cleric spells and spells from the domains of Chaos and Evil as arcane spells.

Nagas favor spells over other forms of combat. Because they are almost always found in the lairs they guard and know well, they can arrange most encounters to suit their wishes.

Spirit nagas meet foes boldly so as to use their gaze attacks to best effect. They quickly slither forward to bite foes that avert their eyes.