Wastri
The Hopping Prophet, Hammer of Demi-humans

Demigod, unknown origin
God of Bigotry, Self-Deception, Amphibians

Symbol Gray toad  
Alignment Lawful Neutral (Evil)  
Priest Alignment LE, LN  
Plane Oerth (the Vast Swamp)  
Worshippers Bigots, cultists, marshmen, bullywugs  
Race Human, bullywug  
Sex Male  
Attributes N/A  
Proficiency Groups Priest, General  
Bonus Proficiency Survival (swamps) 3
Preferred Weapon Glaive, guisarme (and hybrid polearms based on either)  
Allowed Weapons Cleaving and crushing weapons, slings, staff, short blades, scimitar, small throwing weapons, polearms, spears 8
Armor Any, any shield  
Primary Sphere N/A  /TD>
Major Spheres All, Animal, Combat, Healing, Plant, Weather 51
Minor Spheres Charm, Elemental (Earth, Water), Guardian, Necromantic, Protection 23
Additional Spells    
Abilities
  Bullywug and Wastri cultist followers 5
  Speak with Amphibians at will
10 (continuous) + 2 (P2) - 0 (1st level) - 2 (3 powers) = 10
10
4th level Jump (1/day)
5 (1/day) + 1 (W2) - 1 (4th level) - 2 (3 powers) = 5 (minimum)
5
9th level Summon giant toads (1/day, 1-4 toads appear, or 2-8 at level 14 and higher)
5 (1/day) + 5 (P5) - 4 (9th level) - 2 (3 powers) = 5 (minimum)
5
  Shapechange into amphibian form (up to giant size, as druid, 3/day)
Use of this power causes a gradual change to a toad-like human form (similar to Wastri himself)
15 (base) - 1 (2 levels after 7th) = 14
14
Limitations
  Fanaticism: Wastri's followers are violently intolerant of demi-humans, and will attempt to slay them on sight if possibly (they will cower and fawn if significantly outnumbered) -5
  Hit points (d6) as thief -10
  Spells are granted through direct communing with Wastri, who may deny or grant them as is his whim. He cannot, however, read minds with greater
skill than the ESP spell allows.
-3
  +5% experience cost -5
Raiment Gray clothing, bare heads (at 9th level and above, gray and yellow clothing)  
Animal Giant toad  
Holy Days New moons of either moon, celebrated with hunts of demi-humans  
Notes
Animal and plant spheres are usable only on (or to summon) flora and fauna that are native to swamps, or to summon or otherwise affect amphibians of any sort (charm person or mammal is replaced with charm amphibians)
Wastri's priests are at best uncommon, and are found only in rural areas near (or in) swamps
Wastri hates gnomes, dwarves, and halflings more than elves
They are most common in the Vast Swamp region, but are also in the Hool Marshes
Ceremonies to Wastri involve sacrifices (demi-human if possible), strange musical instruments, and croaking chants
Places of worship are usually dim, dark, and chilly
Wastri has a hidden temple in the Vast Swamp (the Sacred Polystery), from which he rules his followers
The high priest of Wastri is known as the Immaculate Image, his three other highest priests are the Greater Servants of Wastri
As a demigod, Wastri's priests are based on 100 points, rather than the standard 120. They cannot use 7th level spells.
Background
Wastri, a bitter, hate-filled god, was once human in appearance. His cult of hatred was banished to the swamps long ago (possibly on another prime material plane). In these swamps, he raised powerful forces of toad-men (bullywugs) and outcasts of humanity, and once again waged war against demi-humans of all forms. As his power grew, his form twisted and changed, living him the toad-like mockery he is now. Wastri still believes himself to be the handsome human he once was. Wastri was originally a mortal, but gained immortality through the strength of his hatred and the dark rituals of his followers. His powers are still quite limited at this time, and he can be slain by mortal hand.

Wastri's cultists seek to eliminate the demi-human plague from the face of Oerth, at whatever cost. They will never willingly enlist demi-human aid, although they occasionally work with humanoids (usually orcs or hobgoblins). His cult frequently enlists the service of bullywugs and lizard men. Most of Wastri's servants are normal humans, fighters, or thieves -- his priesthood is small, and largely concerned with gathering more followers.

Sources
Guide to the World of Greyhawk, pp. 76-77 (original source)
Glossography of the World of Greyhawk, pp. 47-48