"This is so how you supposed to grind KO if you missed too much. You might get it during 100 weapons crafting process but it doesn't required to be like that.
So here's the guide:
1. Pick some fully promoted character who can greatly kill enemies without landing from horse (Odin, for example).
2. Set up your weapon with Boltwind/Boltslay/Windslay (any of these) with the missed attribute with it - Bolt, Wind or slay; The rest is: Absorption, Brilliance, Osmoris, Might, Agility, Courage, Aggression. If you need few gems - set guerdon, otherwise it's free on your choice.
3. (Optional) Pick the rest of promoted team for gem boost (or crystal and Zeus, Gaia and Hades for free divine thing).
4. Choose Taurus tower - 1st level. Your starting and escape position will always be different so it's why you can see two different attempts here - for the proper showcase.
The reason to grind this level is because there's mostly Samurai officers which won't react you with their musou, plus there is no miasma level which is giving proper setup for nice KO."