It's a good thing he drops Dalmy +2 right? The fight itself was not difficult. You can easily pin it and kite around that tree stump or w/e it is in the center of encampment near bastion Martello. Arm Cannon has a range roughly of 22' as someone has mentioned and can easily be outrun. It's every attack is an aoe. I'm talking normal swings. Either that or he multi-hits, because shadows were stripped instantly. It also has very strange hate, as it nearly killed a few people who were just passing by and got too close to it, who had absolutely 0 hate on NM. Happy hunting!
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