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I forgot to pick him up after doing investigation quest. So, I guess triggering condition is you mustn't have him in your party.

You have to reach 100 affinity with Mowen. There're 2 miss-able events. The first one is finding a gift for him, I don't know choosing different options will grant different affinity for him, but I decided to gift him chess board. The other event can be triggered after Xungu Pass battle (or probably after The Wudang Traitor quest), visit Qingxu, he would ask you to look for Mowen in Tancheng city, it'd give you 10 affinity with Mowen, make it reach max affinity with him.

You need to raise his affinity to 100, when he asks for a gift go for chessboard that should be enough

The fight on extreme is tedious. I read all of his skills descriptions but couldn't fathom why he can have so much turns before I can act once. Fortunately, the new legacy system offers a lot of op items and new combos that allow you to catch up with the boss actions. I just finished another playthrough with mara kama's legacy and beat him fairly without exploiting real-time battle mode.

Yeah, it somehow feels like the difficulty of several fights on extreem is balanced against new legacies In the next playthrough i need to find out can we squeeze smth out of Helian Fubi if we beat him in the first encounter near the walls of Xungu Pass. And he better do drop smth decent!