Press the green flag to start the lore! just wait for a few seconds and things will pop up. If ur too lazy to decode it here it is. He was the former husband of his wife, Jane Doe, before his eventual corruption by The Spectre. Ever since then, the code of Old Roblox courses through his body, telling him to outright kill anyone he sees. This includes many Forsaken survivors, which John has grown used to hunting for more than 200 years.
Thank you for @WooperWhopper1 for this idea of Forsaken lore. (Forsaken means abandoned or deserted btw.)