Xerbo
Keeper of the Seas

Lesser God, Suel pantheon [Lesser]
God of the Sea, Money, Business

Priests   (see also druids)

Symbol Turtle's shell  
Alignment Lawful Neutral  
Priest Alignment LN, N, NG, NE  
Plane Water  
Worshippers Fisherman, coast dwellers, sailors, merchants, seafaring barbarians, some druids  
Race Human, elf, half-elf  
Sex Any (mostly male)  
Attributes Constitution 11, Intelligence 10  
Proficiency Groups Warrior, Priest, General 5
Bonus Proficiencies Survival (sea), Seamanship 6
Preferred Weapon Trident  
Allowed Weapons Clubbing weapons, staff, maul, mancatcher, net, lasso, staff sling, trident, gaff, harpoon 5
Armor Any (usually light armors), no shield -5
Primary Sphere Elemental (Water) 4
Major Spheres All, Animal, Divination, Elemental (Air), Guardian, Healing, Plant, Weather 58
Minor Spheres Charm, Protection, Travellers 13
Additional Spells    
Abilities
  Turn Aquatic Undead (1/2 level, rounded down), including any undead encountered on ship or in the seas 7
  Normal priestly followers 5
  Water spells are cast at 2 levels higher (instead of the one level normal for Primary sphere spells) 5
8th level Breathe water at will
10 (continuous) + 3 (P3) - 3 (8th level) - 1 (2 powers) = 10 (minimum)
10
11th level Converse with marine animals
10 (continuous) + 2 (P2) - 5 (11th level) - 1 (2 powers) = 10 (minimum)
10
14th level Shapechange into marine forms (3/day, as druid)
15 (base ) - 3 (7 levels past 7th level) = 12
12
Limitations
  Slow spell casting (all spells of less than 1 round casting time or less have their casting time doubled, 10 or more equals one round) -5
  Prayer must be given before stepping on board a ship or entering water (2 rounds required to pray and ask for Xerbo's blessing on the craft) -2
  +10 % experience cost -8
  Forbidden to use spells or magic items that produce flame or fire  
Raiment Bare head, blue-green or blue with green trim (often in the appearance of seaweed). Breastplates are favored, sculpted to be similar to a turtle's shell  
Animals Turtle, dragon turtle  
Holy Days Watersday, prayer and sacrifice of wine and crumbled food to the waves  
Notes
Animal and Plants spheres may only be used to summon or otherwise affect marine animals and plants
Xerbo is worshipped on the eastern coast of the Flanaess, especially in the Hold of the Sea Princes and Lendore Isle. He is also much revered by sea-faring barbarians.
Osprem is Xerbo's daughter, and temples often hold ceremonies for both (though they are dedicated to only one of the pair)
Dungeoneering and other land-based pursuits are frowned upon by the priests of Xerbo
The Reincarnate spell may never be used to raise those slain by mishaps at sea (except those killed by surface dwellers)
Background
Xerbo, a powerful god of the sea, has a large following on the eastern coast of the Flanaess. He is revered as the provider of life in the seas by fisherman, and placated by those who travel the seas for profit (including merchants and warships). Xerbo's daughter, Osprem, holds province over travel upon the sea, while Xerbo is the master of the seas and all below its surface (though Procan holds otherwise). He is generally on good terms with the other sea gods of Oerth, and teaches his faithful to revere and respect all peoples of the ocean, regardless of ethos.

His priests are expected to ensure that man takes heed of his proper place (on the shore), and that adventurers do not invade Xerbo's realm. As such, they will never help with expeditions below the surface of the sea unless the balance of the ocean is somehow threatened. Xerbo is served by both priests and druids, and the two often mix freely at his temples.

Sources
Dragon #90, Gods of the Suel Pantheon
Len Lakofka's GreyTalk posts on the Suel Pantheon