Cleric

Clerics will remain largely unchanged mechanically from the ones presented in the PHB. There are no water-creating or water-controlling spells; spells that would perform these functions instead work with silt. Spells that influence survivability in water (waterbreathing, etc) also operate with silt, however.

Clerics are divine casters, and as such, they cannot choose to defile or preserve, though they typically align along the Path of the Preserver due to the fact that they typically draw their magic from the natural world in a fashion similar to druids because there are no gods of Athas. For this reason, you tend to see sun clerics, desert clerics, occasional silt or lava clerics, clerics of the wind, or one of the twin moons, etc.

However, a cleric can draw their power from sorcerer-kings in a way that is similar to Sorcerers; if this is the case, treat the sorcerer-king as a cleric's deity, pick a domain according to what best fits that sorcerer-king, and treat the cleric as though they were arcane casters when it comes to preserving or defiling.

The only clerics that may cast Inflict spells are those that receive their spells from a sorcerer-king.