When the Reaper-killer known as Leviathan fought the Collectors, it severed their connection to Harbinger with a thrall device. Most Collector forces died as a result, but a few survived. Now, these rare individuals fight for the memory of their people, a proud race broken by the Reapers. Protheans appointed avatars to embody and model a single virtue for their society. The Awakened Collectors' virtue is vengeance.