AstralLein
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I completed the game in 5 months on veteran difficulty. I decided not to switch to light or dark factions but played through the entire game as Chaos. I invested in mentorship and used additional heroes with high agility to defeat the main heroes, so I didn't encounter any problems. Moreover, with Railag having a spell power of 55, boots with a 5000 damage meteor shower spell, and a lucky wizard, I didn't feel any resistance.
Interesting strategy. It reminds me of the old tactics from Heroes 1, where there was a trick with using heroes with Armageddon spells. Thanks for sharing the walkthrough!