Serving the gods as holy warriors, Dervishes stand confidently in the whirlwind of conflict. Martial techniques perfected in the deserts of Elona allow a Dervish's scythe to lash out quickly at multiple opponents, surrounding the holy warrior with a swath of destruction. Initiates often learn spells of self-protection, prayers that rush a warrior into battle, and invocations that empower attacks with elemental fury. Masters of the profession can assume the form of a god, enacting divine will with holy blessings. Keenly aware of the conditions of a fight, a Dervish can reap great benefits by using multiple Enchantments. Wandering the savannahs and deserts of Elona, the faithful Dervish chants prayers to the earth and wind... and the fury of the sandstorm answers in response.
Source: The Game Website.
A dervish is typically characterized by his or her ability to whirl, or spin, in a controlled manner, often engaging in combat or the casting of magic at the same time.
They are usually reminiscent of the historical Sufi Muslim asceticism which included a traditional whirling dance while wearing robes that flow outward as the spins are made.