Revenants start to spawn when approaching settlement within 700m. Settlement will turn green at the same time which means the mission is now “activated“. There's a slight delay for their spawning though. Revenant's beam range is roughly and detection range for ships might be as well. Scarab SRV is treated the same as CMDR on foot: stay out of their line of sight and all good. However lack of perfect hiding spot near/in settlement makes Scarab approach unfeasible. I didn't test it with Scorpion but it's said to be attractive to scouts. Scouts will constantly come around and replenish revenants. Materials drop from dead revenants are Thargoid Carapace, Tactical Core Chip, Sensor Fragment and surely be more. Killing Revenants with ship weapons will cause interceptors to spawn in. And instant EMP. So don't strafe them at beginning if you are running the mission alnoe. Base on info above the best solution (for now) is: Quickly land near settlement buildings, disembark and dismiss ship. Your ship will be in mid air when revenants spawn and will attract their attation. Use cover to approach power building. When all ground stuff is done the safer way out is to walk at least away from settlement and call back ship then leave. Your ship might take some damage but it will be okay.
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