While hunting in Winterspring, Reynah received word from an ally from the Alterac Valley that her brohter, Rinn Firecaster was killed by the Scarlet Crusade. When she arrived to Undercity she begged Varimathras for an audience with Sylvanas Windrunner demanding justice for her brother who was killed in their lands. Varimathras however brushed her off, telling her that Sylvanas as more to worry about than one death and if she wants justice done do it herself. On her way out, she accidentally bumped into Barnabas Grell and the two had an argument, threatening to kill one and other if they saw each other again. After leaving Undercity, Reynah hunted down Scarlets until she ran into Barnabas. Before the two killed each other, they came to an understanding that they both were hunting the same targets and decided that, until they killed the Scarlet leader Renee Lauer, they would work together.
The two attacked attacked the Scarlet camp and managed to capture Renee. However the two began arguing over who would deal the killing blow, allowing Renee's allies to arrive and incapacitate both of them. Before their execution Barnabas and Reynah told the Scarlets they vowed vengeance over the deaths of their loved ones and asked Renee why would she kill innocents. When Renee responded that the Forsaken and the blood elves were a disease in infesting human lands Reynah attacked the surrounding Scarlets with her fire magic, until they were cornered and injured explosives. Reynah was killed when a Scarlet broke her neck, while Barnabas was killed by decapitation. Moments later, Forsaken lead by Sylvanas Windrunner and Varimathras killed the entire camp, and raised Renee Lauer as one of the undead.