Sentinel SF-Null

"'Keep playing your part, deny it's destruction, a replacement is on route, any new protocol is up to you.' - A Sovereign Protector to Admiral Zyndic"Sentinel SF-Null was a repurposed Type 1 Sentinel Contingency Droid used for hunting down Inquisitor Falon Tarr during the early months of 5 ABY, after several failed attempts to catch up to him the Messenger finally located Falon Tarr and led the Claw to him, following the destruction of SF-70, The Claw transported SF-Null to the Triumphant alongside Falon Tarr to pose as SF-70 in order to not put the mission of finding the heart of jeopardy.

Construction and Early actions
Unit SF-Null was constructed sometime in 20 BBY On Vetine alongside other Sentinel units and programmed as a Type 1 Messenger, intended to find a loyal Imperial and assign a world to destroy, however at some point in 4 ABY after Falon Tarr escaped from Centax II and eliminated another Type 1 Messenger SF-Null was discharged from it's mission and reprogrammed by the Claw to search for Tarr as it's candidate and lead him to Tarr.

Hunting Tarr
During the Early months of 5 ABY SF-Null among others participated in the manhunt for Falon Tarr, it's first known action was arriving on Terra Sanui after Bragon and Pli'a had left alongside the Claw and a detachment of Red Clad Stormtroopers, SF-Null surveyed and tested the rubble, confirming to the Claw Tarr had been there moments earlier.

Later in 5 ABY SF-Null and the Claw travelled to Zygerria after Bragon and Teko Ri had left, SF-Null tested King Iana Kanek's body and confirmed him as The Feral, Tarr's former associate. The Claw overlooked the evidence and quickly figured out that Teko Ri was infact Falon Tarr and ordered unit SF-70 reconnected, vowing silently that no-one would interfere with the Emperor's plans.

Weeks later the Claw and SF-Null arrived on Batuu narrowly missing Tarr as he escaped with Pli'a as his prisoner, the detachment of Red Stormtroopers with them turned the town upside down, searching for Tarr, however the Messenger set his eyes upon Tarr's abandoned Eta-2 Actis, The Claw lamented it would be impossible to pursue him here and ordered Stormtroopers to collect the deactivated AD-4 and R2-Y22 and take them to the shuttle, after the Claw left the Messenger remained alone, muttering that Tarr was but one of many assets...

Finally SF-Null caught up to Tarr on a planet strong with the force in the unknown regions, the arrival of it, the Claw and a fireteam of Sovereign Protectors forced Egathons force spirit to retreat, leaving Tarr alive and unconscious. When the Inquisitor woke he panicked and lashed out, lunging at SF-Null in an attempt to kill it, however the Watcher intervened from afar and after words of warning, encouraging him to cease his rebellious tendencies, Tarr was immobilized and dragged off to the ship by protectors, screaming that he would be free.

On route to the Triumphant news arrived from the Protector detachment onboard that SF-70 had been destroyed, in a hurried attempt to not loose control of the operation SF-Null was reassigned and left on the Star Destroyer to pose as SF-70.