Xacarba

Fiends hailing from the darkest reaches of the Abyss, xacarbas are manipulation and destruction intertwined. With their infamous ability to redirect spells, these serpentine goliaths wreak havoc on the mind as well as the body, turning allies against one another and reveling in the destruction doing so produces.

constrict (2d6+9)

Redirect Spell — Any creature that attempts to cast a spell within 30 feet of a xacarba must cast the spell defensively. If the caster fails the concentration check to do so (or if the caster opts to not cast defensively), the xacarba can choose the target of the spell as a immediate action. The new target must be a legal target—if there's no legal alternative target to choose from, this ability cannot be used.

change shape (any humanoid as a swift action, but always retains one serpentine trait that negates the bonus to Disguise checks; alter self)

Combat Reflexes, Dodge, Improved Initiative, Improved Iron Will, Improved Vital Strike, Iron Will, Lightning Reflexes, Mobility, Spring Attack, Vital Strike

Acrobatics +25 (+29 jump), Bluff +30, Climb +17, Diplomacy +27, Disguise +27, Intimidate +27, Knowledge (arcana) +31, Knowledge (any two) +31, Linguistics +28, Perception +29, Sense Motive +29, Spellcraft +31, Stealth +16, Use Magic Device +27