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To eliminate a monk without significant losses, you need a hero of at least level 12. And don't lose your Vampires; level them up in defense, evasion, and reflection.
Erazeal – the main thing here is to weaken (or even kill) him with a garrison. Therefore, auto-battle is not an option. The main goal is to eliminate the imps and elementals.
The left outpost, where the Griffins are, shouldn't pose any problems.