Need energy engine :(

I dont have energy engine. is it possible to get energy engine from any boss mission instead of ramboy ?
I have only 1 phy mech it seems ramboy never drops energy engine.
I had collected 500 Token from daily quest to buy 5x two boxes during off sale but no luck.
Sm account created 2 month ago :frowning:

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I have been farming insane mission 6 at overlord’s den , i dropped a few of those

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i got 2 last week just be patient and humilliate ramboy as much as u can xD

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You guys need to go solar


i found it from insane ramboy