This was the hardest boss for me so far and took a while. I made attempts on and off as I grinded XP and did other missions, etc, so I dont have a completion time. Powering up definately helped. I went with an aggressive approach. I chose Mad Tiger spirit which reduces my health massively but gives me higher attack, plus some pills that buffed attack and other stats. I wasted all my good shit pretty much. I was on my last of a rare potion that increases critical attack rate, damage and overall attack power and paired that with Tiger subduing and enchanced tiger subduing pellets for a triple attack buff. I assume it stacks. My maxed out the clone magic too. My goal was to shred more than half of the bosses health with a bombardment of all my abilities, plus regular combos, then finish the boss off by regenerating some of my other magics again and countering carefully. This boss takes very little damage and is super fast, aggressive, so it makes it hard to heal at all during his later phase. The new transformation I got from defeating the Blacksmith was great. It does alot of damage to him overall. Didnt realise this was an optional boss, as no new paths opened up, so now Im lost again. I assumed he was blocking my path. I did get his transformation though, so maybe that will be worth it. I am killing every boss I can find so far, but its tough to figure out which ones I havent beaten yet, when searching for info and locations online.