An Ex-PAX Scientist is a former researcher from the lost Protoss Advance/Experimental Facility. Once, they assisted in pushing the boundaries of scientific exploration. There work was often controversial to the other castes and fellow scientists. After the loss of Aiur, the remaining leaders gave them some freedom in researching ways to defeat the Zerg. As the extent of these experiments became too unethical, some the staff resigned to lesser posts (Mass Effect 3: Ex-Cerberus). When reports of the facilities destruction reached them, most felt a mix of grief for former colleagues and relief form the horrific tragedy. As a way of atonement, all remaining researchers requested to assist in reclaiming Aiur. Though met with some resistance, the leaders could not ignore the need for highly skil