I found baboon boy the hardest, then Melissan. Mel is just hard because you have to fight her multiple times. I had a tank heavy party too so I foun one big creature I could bash easier than groups of special creatures or mages with lots of protections so I couldn't bash them. The dragons were easy for me as I could deal out massive damage quickly. Balthazar is the hardest with Daves upgrade patch installed.
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