Hi there, Thanks for reaching out! If you’re only missing the defeat of the Taken Servitor boss, we suggest you try to eliminate it a couple times, making sure to return to Orbit between attempts. Additionally, it is currently a known issue where the Mote of Light dropped by the Taken Servitor may be flung from the boss on defeat, so it may not appear directly where they fell. Please note, we’re currently addressing an issue where the triumphs tracking the defeat of Overthrow bosses are not working as intended. Therefore, please don’t rely on these Triumphs as confirmation of your successful defeat of all unique Overthrow bosses.