Originally Posted by Gleylancer
Take Fortune Hunter for example, in "Yellow Turban Conflict", there's endless soldier spawns at the start of the stage after the gates right behind you open. Grind 1500 kills, then proceed. Before you slay any named officer, save your game. If you get the Fortune Hunter skill upgrade after the kill, save again and proceed, if not, reload. The other skills may be grinded this way as well.
This for sure. I've never seen this strategy online and yeah this works wonders. Save before you kill 3 officers and it makes a world if difference. I went from a 16 fortune hunter to a 20 in 1 hours work. I had no idea it was so random.