Bad roll... As it was pointed out in this thread, the leadership of Ahriman and/or the Necromancer varies greatly, much more than in KBAP/CW. This can really turn a no-loss challenge into a hopeless one. Not easy to fight units worth about 6000+ leadership on level 4 or 5.
Since you are posting it, and you did show that you're really good in KBAP/CW and beat the game in record time, that is the only conclusion I can draw.
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