Orc Drummer? I've killed 3 already and are in lvl 12. Killed my first once I headed to Rivertown. Used poision arrow on it so he couldn't heal himself. But that's with ranged. Using melee as a warrior I had to be in a much bigger lvl.

About stormfist castle, I went there when I had finished everything possible in Rivertown and Verdistis, and a bit in Dark Forest.