- Titles: The Camel, Source of the Celestial River, Lord of the Inundation, Lord of Oases, Soul of the River, Lifegiver, the Eternal Spring.
- Aspects: Drinkable water, hippos, oases, wells, rivers, springs.
- Symbol: A single drop of water.
- Priesthood: Jugs of Apsu (priests); Bulls of Apsu(paladins).
- Herald : Apsu’s heralds appear as hippo-headed humans.
- Holy Days: Every Yaus al-Ittrou is a holy day. The first day of Amt Alak Arkhet is a high holy day.
- Duties: Protect oases, wells and other sources of water, keep water sources pure.
- Sins: (Minor) not sharing water with a “good” creature, not drinking your share of water each day, not cleansing a polluted water source, not helping a hippo in distress; (Major) allowing a water source under your direct protection to become polluted, wounding a hippo, failing to offer a quart of water to Apsu each morning; (Mortal) polluting a water source, killing a hippo.
- Signature Power: Elemental manipulation (water only).
- Powers: Barrier, beast friend (river creatures only), boost/lower trait (Vigor, Boating, and Swimming only), burst, champion of the faith, elemental form (water only), energy immunity (fire, heat, and water only), environmental protection (water only), etherealness (watery body, no corporealness), fatigue, feast (provides 2 quarts of water per Rank, but no food), fog cloud, glyph, hamper movement, healing, sanctuary, shape change (river creatures only), sphere of might, stun, succor, summon beast (river creatures only), summon elemental (water only), summon herald, water walk.
- Trappings: Clergy must use water trappings whenever appropriate. They cannot take dust or earth trappings.
Without water, there would be no life in the desert. From the banks of the mighty rivers to the scattered oases, water is the lifeblood of the sands, and Apsu commands all potable water. It should be noted that Apsu has no control over the sea. Apsu is depicted as a human with a hippo’s head carrying a jug of water.
Shrines exist at every oasis, even those controlled by Devoted tribes (though they do not worship at the shrine). Even wells are inscribed with the holy symbol to ensure Apsu protects them. Temples are found in most major cities, as well as along the banks of rivers, and are built around a pool, in which wallow sacred hippos, or spring. Apsu’s clergy protect water supplies, whether they be a city’s cisterns or some remote spring, and care for hippos (a somewhat dangerous task). Protecting and maintaining the irrigation channels is one of their most important jobs, and even nomadic clerics are expected to help with this. Many also travel the deep sands, looking for new sources of water or mapping the course of old water channels.
Each morning, clerics must pour a quart of water onto bare ground, in honor of their god. Failure to do so is a major sin, for it is commonly believed that water spilled on the ground helps fill the Celestial River, from which all oases, springs, and rivers are filled. Most festivals revolve around ritual washing. After the celebrants have finished their ablutions, the water is poured onto the sands, carrying the sins of the washed with it.