BIO:  Not much is known about Sierra Mikain before she recieved the Moon Rune. No one knows how she came to posess it, but she came to posess it over 800 years ago. After being posessed by the Moon Rune, Sierra seems to have taken the lives of many due to the Moon Rune's dark desire to draw blood. In order to escape from this curse, Sierra retreated deep into a forest, where she found an abandoned cottage. She spent decades living in that cottage until a young knight wandered to her cottage, mortally wounded. The knight uttered words of remorse for being unable to protect his liege as he slowly died. Sierra took pity on this young and handsome knight--Rean Penenberg--and gave him the curse of immortality. Rean left Sierra for a while to avenge the death of his liege, but came back to spend centuries together with Sierra. The time spent with Rean was the best time in Sierra's life..

After a while, people who wandered into to the forest for similar reasons--to end their life--ended up in the merciful fangs of Sierra and the vampiric village of the Blue Moon was soon founded. The village prospered for centuries with the power of the Moon Rune radiating from a central altar, allowing vampires to live on without feasting on blood. However, the Moon Rune was stolen by Neclord, a new member of the village. This led to the death of many of the villagers who have lost the protection of the Moon Rune. Some of the vampires, however, escaped to continue their existence while feasting on the living. Rean was one of them. Sierra was immune from this due to her being the coven mistress, but was devastated by the death of her long-time friends. Yet, she was determined to stop the renegade vampires from causing suffering to others and thus she became a vampire hunter.

After hundreds of years, she is asked by a Harmonian swordsman--Nash Latkje--to help him find information on True Runes. She joins him for no particular reason, or so it may have seemed. She was actually trying to get to Rean Penenberg's manor near the Jowston-Highland border. Once at the manor, she is allowed to enter, but Rean doesn't show himself at all. That night, zombies attack Sierra and Nash, along with the butler and maid who were both vampires themselves, obviously created by Rean. Sierra lets Nash deafeat all of them while conserving her power for her confrontation with Rean. During the confrontation with Rean, Rean subtly manipulates Sierra by acting like he is naive. Sierra takes pity in his confusion and gets close to him to stab him and cast the Song of Evanescence. However, Rean was waiting for her to get close enough to allow him to suck her blood, which gave him great power. Nash tried his best to fight against Rean, but it becomes quickly obvious that there is no chance he could win, so he allows Sierra to suck his blood to regain power. This gave Sierra enough power to destroy Rean outright. After that, she abandons Nash and heads towards Tinto after sensing Neclord. At Tinto, she sleeps in the Drakemouth Village Inn for a long time. However, she is visited by Kahn Marley and the Hero who were looking for her. She joins them to fight Neclord and with the joined effort of Viktor, Kahn and Sierra, Neclord is destroyed. After that, Sierra deicdes to stick with the Allied Forces a bit. However, even after the war, she stays and lives among the humans.