Dechala

Dechala the Denied One is a now-forgotten Chaos Champion from Warhammer Fantasy Battle, being an Elf who converted to worship of Slaanesh. She was one of the original Chaos special characters to be released back in the day for Warhammer as part of the Champions of Chaos splatbook.

Dechala looks like an elf-maiden with six arms, milky white skin, a giant snake's body from the waist down, multiple sting-bearing tailtips that secrete a euphoria-inducing corrupting venom, and glowing deep blue eyes.

Slaanesh champions tend to be quick 'n' choppy, and that tradition definitely started with Dechala; eight inches of movement, and then she's tossing out six attacks with Weapon Skill 8(!) and Initiative 10(!!), all of which are hitting at Strength 5 and due to a special rule prevent those wounded but not killed by her from being able to attack her for the rest of the game? Holy shit... She also has Hatred for all Khorne daemons and mark-bearers, and her "Dances of Slaanesh" give her a couple of special options, including imposing a -1 on To Hit rolls against her, giving herself a +1 to her own To Hit rolls, or trading 2 attacks of her own to automatically parry (and thus negate) one enemy attack per two she gives up. She admittedly can't take much punishment (only 2 Wounds), but at Toughness 5, that's still not as easy to strip away without cannonballs to the face.

One probable reason why she hasn't resurfaced is because of the complexity of her rules (doubtful, given Archaon and Nagash are still playable). Another is because "six-armed sword-waving battle-dancing lamia" is an image pretty damn close to the Marilith, a demon from Dungeons & Dragons, and GW fears accusations of copyright infringement if they use her.