|The wise and faithful|
Telara’s original wielders of magic gained their powers through pacts with minor elemental spirits. Through devoted study, these Clerics reached out to ever-more-powerful beings, soon communing with demons, faeries, and gods. These holy men founded a number of spiritual disciplines: some focused tightly on a narrow ethos, while others retained more free-form theological allegiances.
Although those who take up this calling boast extensive knowledge and keen intellect, Clerics value wisdom and faith above all else. Intensely focused, a Cleric tackles any endeavor secure in the support of powerful beings incomprehensible to the layman. These beings’ exact nature depends upon each Cleric’s culture of origin and spiritual training regimen.
Clerics are renowned for their powerful support magic, able to repair the most grievous injuries or cure the deadliest diseases. The spells at a Cleric’s command are as varied as the patron deities they follow. Many Clerics are also capable combatants who rain divine wrath from afar, or wade into the thick of battle, warhammer swinging.
Clerics fuel their spells with the arcane energy known as mana. Granted by their patron deity, a Cleric’s pool of mana is not limitless and must be carefully managed, lest the Cleric deplete his reserves in a crisis.
The militant orders gird themselves in chainmail, and march into close combat wielding heavy, two-handed warhammers, or a simple combination of mace and shield. The more arcane priesthoods, meanwhile, wear cloth vestments, brandishing symbols of spiritual power such as staffs, tomes, and totems. 
- Official Rift Game page on the Cleric - Riftgame.com