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Guilty Spark was the monitor of Installation 04, and became instrumental in the defeat of the Covenant at the end of the Human-Covenant War.

HOMEWORLD: Erde-Tyrene (Earth)
BORN: c. 97,445 BCE
DIED: N/A

 

 

SUMMARY

343 Guilty Spark started life as the human Chakas on Erde-Tyrene, now known as Earth.  Chakas' experience with the Ur-Didact and IsoDidact eventually led to his mind being uploaded into the carapace of a Forerunner monitor, initially called Monitor Chakas, then 343 Guilty Spark.  Guilty Spark was assigned to Installation 04, which he served on for nearly 100,000 years until its destruction at the Battle of Installation 04.  After the Halo's destruction, he was captured by the Covenant, who led him to Installation 05 and later the Ark.  Guilty Spark was instrumental in helping John-117 and the Arbiter defeat the Covenant at Installation 00, though he turned on the UNSC forces, killing Sergeant Johnson.  Guilty Spark was rediscovered by the UNSC Rubicon on Installation 00 in 2554, where he stole the ship and left the Installation for his own purposes.