Chapter 5, Mission 4
Enemy Hero: Omni Knight
Enemy Level: 190
Energy Cost: 60
- 0% Mastery: 300 Exp, 3000 Gold
- 100% Mastery: 360 Exp, 3600 Gold
- 200% Mastery: 420 Exp, 4200 Gold
- 300% Mastery: 480 Exp, 4800 Gold
The most common strategy for this is just to spam Fire Dragons on him. Now if you find that your dragons are dying you might want to notice that this guy is level 190. It's quite possible to get to this point being only level 40 or so but really you should be much stronger than that by the time you fight him. If your fire dragons are dying, go level up and/or get some better gear and try again.
Alternatively if you have beaten it once before and are coming back to it, or you have grinded up some levels and have decent gear (mainly some dime axes) then you can certainly rush him with White Tigers and Goblins. This isn't advised for anyone that is low level however (anyone under level 100 at least). If you feel confident that you can handle it though, go for it, just don't be surprised if you die because they can't kill him fast enough if you don't have the gear or levels.