When the Sentinels took over the Farrago, an Invid escort vessel let loose the Pursuer in order to destroy the slave craft. By this point, this Pursuer was the last of its kind and struggled with its target due to the fact that the vessel did not make use of Protoculture as its power source. Initially, the Sentinels believed they had destroyed the Pursuer but evidently it survived. As such, the Invid installed a Protoculture homing beacon on the Farrago to trace it but its weak signal meant that the Pursuer did, on occasion, lose track of its prey.