A demon from the Netherrealm, her occupation is that of a demon hunter. Ashrah's weapon of choice is her Kriss, a type of sword that is similar to the Dragon Sword that Liu Kang used in Mortal Kombat 4. This weapon is believed to have been "blessed" or is of a "heavenly origin."
"Noob Saibot was not originally a demon, which might explain why Ashrah sensed such great evil in him: He had to earn his place in the Netherrealm. He actually desired to remain there. His companion, however, seemed to be having a problem adjusting. Perhaps there was some good left in the cyborg. Whatever the case, Noob would have to face Ashrah alone. Ashrah defeated Noob Saibot and finally earned her ascension from the Netherrealm. But the sword that made her escape possible did not travel with her. I suspect it still remains in the Netherrealm, waiting to release another of its denizens from damnation."
"The power of Blaze purified Ashrah completely; she was transformed into a being of divine light. Her radiance soothed even the darkest of souls. With new purpose, she traversed the realms in search of evil, pacifying the wicked. Her mission came full circle when at last she purified the sorcerer who would have her slain: Quan Chi."
Ashrah has possession of a powerful, holy artifact known as the Kriss, a weapon that has the ability to clean the sould of its user. By slaying demons, its wielder gradually becomes more pure/holy, effects that are shown in Ashrah. It's power is not limited to just affecting the user's essence, but also their personalities. Ashrah turned against her demon brethren and seek to become purified.
Despite Ashrah's origin as a demon, she wields holy powers as a side effect of wielding the Kriss. The Netherrealm itself rejected her holy being when she defeated Noob Saibot, however the sword remained behind.