I like the general idea, though I'm not sure how many systems should have something of the sort. I'd think in the major house systems, they'd have a lot of good warning measures.
In some of the outlying systems, some interesting random situations would be quite interesting. The anti-cruise effect would be neat. Or in systems with radiation, if it could flare up to do different amounts of damage. Maybe something different in each system that would be appropriate?
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