Hmm- I just realized that you requested priestesses of Lolth. Whoops- I did one that is not Lolthy, but rather focused on madness. Hope you can still use her...
Thelcia, Drow Priestess --- Level 14 Controller
Medium fey humanoid --- XP 1,000
HP 135; Bloodied 67 --- Initiative +11
AC 28; Fortitude 24; Reflex 29; Will 25 --- Perception +13
Speed 6 --- Darkvision
TRAITS
Maddening Screams * Aura 3
A creature other than Thelcia that starts its turn in the aura is dazed until the start of its next turn.
Depths of Madness
Whenever a creature makes an attack with the charm or psychic keyword against Thelcia, that creature takes 5 psychic damage.
STANDARD ACTIONS
(mbasic) Mace (weapon) * At Will
Attack: Melee 1 (one creature); +19 vs. AC.
Hit: 2d8+13 damage.
(melee) Touch of Madness (charm, psychic) * At Will
Attack: Melee 1 (one creature); +18 vs. Will.
Hit: 3d6+12 psychic damage, and Thelcia slides the target 4 squares.
(area) Maddening Darkfire (psychic) * Encounter
Attack: Area burst 2 within 10 (each enemy in burst); +15 vs. Reflex.
Hit: The target grants combat advantage and cannot benefit from invisibility or concealment until the end of Thelcia's next turn.
Effect: The burst creates a zone that lasts until the end of Thelcia's next turn. An enemy that ends its turn in the zone chooses: it takes 10 psychic damage, it falls prone or it makes a basic attack against a creature of Thelcia's choice.
Sustain Minor: The zone persists.
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Skills Intimidate +15, Religion +17
Str 16 Dex 18 Wis 23
Con 15 Int 20 Cha 16
Alignment Chaotic evil --- Languages Elven, Deep Speech
Equipment chain mail, buckler, mace
Thelcia (full name Thelciathakaroxi) is a priestess of powers of madness (if you are using the default deities of 3e, 4e or Greyhawk, she worships Tharizdun; in another mythos, choose an appropriate deity). Even her own kind will have nothing to do with her; she is too powerful to simply slay, too capricious to ally with and too dangerous to let run loose in a Drow community.