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“Destroy Sekrion” is an objective in the Strike The Nexus Revisited in Destiny: Rise of Iron
Walkthrough - Vex[edit]
Sekrion, Nexus Mind has a significantly upgraded Chassis to support it.
The newest attack you will need to worry about has motes off energy drifting up from the ground beneath it. When this attack resolves, your Guardian will be Marked by the Void. This is a debuff out of the Vault of Glass. it will function like it did within the Vault. Your screen will slowly be filled with black so you cannot see. It will do this at 75%, 50% and 25% health.
Unlike the raid itself, you do not need to use the Aegis Shield to clear the debuff away. There will be a pool of light that will allow you to cleanse it. The problem is going to be the large number of Vex around it. Expect to deal with Goblins and Hobgoblins. The pool will appear in the same place throughout the match if the Guardians remain in the same area. It will move to a different, closer, location if the Guardians rotate.
Use the various raised areas to quickly get into cover. Duck out when the shield has rotated out of the way. Begin firing on the Eye of the enhanced Hydra to do damage to it. Throughout the fight, it will unleash the Mark of the Void. Watch for the pooling energy to know that it is coming. Also know that the cleansing pool, while guarded, will also be marked.
Remember though, do not immediately rush Sekrion when you have destroyed it. Its body will explode a short while after death. Wait for that to happen and then rush in for the drops.