Actually, I take that back!
First I found death star, which was awesome, then I found Black Hole, which just trumphed everything!
Instant 12k dmg on first turn on everything made the endgame easy as pie
Think I had around 60 int!
edit: have to mention that is also works on black dragons, which is part of the reason it became easymode:>
Doesnt work on gremlin towers though, but geysir took care of that easily enough..
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Buy no2 vaporizer