There's a secret boss hidden in the Cosmodrome.
You can't kill it... yet 😉.
There's a shielded bubble nearby when you get the boss low enough that will unlock, but there doesn't seem to be a reward... or anything in the bubble.
Maybe there's other parts to this mystery 👀? Maybe... they're live right now. Maybe....
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Ummm you can get rid of it... its part of the archie quest