Corporal Streln was an ISB agent on Imperial Center after to the Battle of Yavin. Along with Gonrey and Vypass, he helped design the YI-5 probe droid. Ysanne Isard ordered the execution of the three when it was revealed that the probes, like her, would have blue and red eyes; however, she later decided to spare them, assuming it was an innocent mistake.
Sources[]
"Coruscant: Center of the Empire" (original article link) on Wizards.com (content now obsolete; backup link) (First mentioned)
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