The event at Nessus near Exodus Black with the huge servitor is broken. When you shoot the servitor down very quickly so that it shields and spawns the small satellite servitor, and then destroy the small servitor very quickly, the event will not proceed and the servitor will not lose its overshield.
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That’s because it has a limit to the damage you can do per mechanic. Stop trying to burn the servitor and let it do its damage phases and it will work properly every single time…. Every Single Time. Do about a 1/4 damage to get the 3 minis to spawn… kill them quickly…wait until the shields drops then damage. If you continue to shoot or do too much damage you will bypass the mechanic and lock the shield. It’s not broken , players are just stupidly trying to burn everything they see.