Syrul
Mother of the Brotherhood

Lesser Goddess, Suel pantheon [Lesser]
Goddess of False Promises, Deceit, Treachery

Symbol Forked tongue (preserved, cut from a serpent or devil)  
Alignment Neutral (Lawful) Evil  
Priest Alignment NE, LE, CE  
Planes Hades  
Worshippers Humanoids, members of the Scarlet Brotherhood, politicians, illusionists, con men, spies, hags  
Race Any, including humanoid  
Sex Any (mostly female)  
Attributes Intelligence 12, Wisdom 12 -1
Proficiency Groups Rogue, Priest, General 5
Bonus Proficiency Fast talk 3
Preferred Weapon Mace, dagger  
Allowed Weapons Clubbing weapons, flails, staff, staff sling, maul, mancatcher, lasso, whip, scourge, dagger, knife, stiletto 3
Armor Chainmail or lighter armors, any shield -5
Primary Sphere Charm 10
Major Spheres All, Divination, Healing, Law, Necromantic, Summoning, Thought, Wards 73
Minor Spheres Guardian, Protection 8
Additional Spells The Black Circle (6th level), Obscurement (2nd level) 1
Abilities
  Control Undead 15
  Normal priestly followers 5
3rd level Obscure Alignment (1/day)
5 (1/day) + 2 (P2) - 1 (3rd level ) - 2 (3 powers) = 5 (minimum)
5
7th level Undetectable Lie (1/day)
5 (1/day) + 4 (P4) - 3 (7th level) - 2 (3 powers) = 5 (minimum)
5
9th level Evil Luck: the priest is granted a Vision spell (once only) for only a token sacrifice of an object of value, and a permanent +1 to hit on weapon attacks
7 (base cost) - 4 (9th level) = 3
3
14th level Summon a nightmare as a steed (1/month, human sacrifice required, remains for 24 hours)
0 (1/month) + 11 (P7 x 1.5) - 6 (14th level ) - 2 (3 powers) = 3
3
Limitations
  Hit points (d6) as thief -10
  Fanaticism: Priests of Syrul will only willing associate with priests of the other gods of the Brotherhood (Pyremius, Malikon, Tharizdun) -3
Raiment Golden-yellow robes adorned with red forked tongues (in ceremony only), yellow and brown clothing otherwise, shaven head if male  
Animal Venomous snakes  
Holy Days Moonday and full moons of Celene, human sacrifice on Midsummer's night  
Notes
Syrul, along with Pyremius, Malikon, and Tharizdun, is one of the primary gods of the Scarlet Brotherhood
The Scarlet Brotherhood was formed by Syrul and Pyremius
Syrul is worshipped in the barbarian states (but with no formal churches), Lendore Isle, and in the thieves' quarter of any large city
Worship is held outdoors during full moons
Any member of the Scarlet Brotherhood who attains 9th level will receive a similar Evil Luck bonus, with monks being granted on +1 to hit with unarmed attacks instead. This bonus is granted in a special ceremony which Syrul herself will attend.
Background
Syrul, the Mother of the Brotherhood, formed the Scarlet Brotherhood with Pyremius in an effort to halt the decline of the Suel race. She has violent hatred for Rao, Pelor, and other good-aligned deities, and gives special favor to any of her priests who capture their clergy for the altar. Syrul's faithful are expected to work their way into the circles of power in whichever country they may dwell, and turn them towards the cause of evil. As such, worshippers of Syrul can be found in the ruling councils of many great cities, including Greyhawk herself.
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The majority of Syrul's priesthood is centered in the Scarlet Brotherhood, although she also has strong followings amongst the lesser humanoids (mostly goblins and orcs). She is also the queen of hags, and is revered by all their kind (even the ancient Iggwilv). Her worshippers outside of the Scarlet Brotherhood and humanoid-controlled areas are mostly thieves, illusionists, and politicians, with very few priests.
Sources
Dragon #88, Gods of the Suel pantheon
Len Lakofka's GreyTalk posts on the Suel Pantheon