Here is what traditionally is said of clerics:
Clerics are versatile figures, both capable in combat and skilled in the use of divine magic. Clerics are powerful healers due to the large number of healing and curative magics available to them. With divinely-granted abilities over life or death, they are also able to repel or control undead creatures. Whether the cleric repels or controls undead is dependent on his alignment.
Their specific powers can vary. Clerics often make good leaders.
As the game goes on, we will find out more about Dwayness and his skills.