While having dinner at the Crimson Dawn house on Thorum, she discussed tattoos with Noyio. During a briefing on how Crimson Dawn would deal with the Hammers, Thallia was pleased that the plan would require stealthy sabotage, but was disappointed that they couldn't destroy the Hammer's ships. After the heist, it was decided to send the Hammers a message about operating in Crimson Dawn territory. Thallia was tasked to join the group as a low-level recruit and keep an eye on a list of targets. She and Olio posed as a married couple to make recruiting easier. When it was discovered that someone in Crimson Dawn was selling information to the Hammers, she was framed by Cerveteri Slane and was executed by one of Dryden Vos's guards.
Thallia was a skilled slicer and was able to teach Qi'ra how to do it.