I've been on many Nova runs. Based on my observation, they have only dropped for those using miners luck. All the other theories about how to do the run didn't matter. I've seen them drop with chests opened or left closed, bombs exploded, bombs not disarmed, bombs disarmed, hostages saved or not saved.. etc
Bottom line...if you want a nova use the elixir... I've never used the elixir and never got one yet. But all those that used, eventually got one or even a few!
Uavaota
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