Niemand
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The AI uses a tactic where it places a stack of Nagas one tile further forward than the tactic allows. I tried to replicate it, but I couldn't place the stack on that tile. The AI's Nagas can reach the mages, but mine can't. Basically, the AI is a super cheater.
This trick has been known for a long time. Not long ago, there was even an argument about it in the online games section. Check out the "Bugs" section of the FizMig forum.