Any character with the Maxed Fast Throwing skill carrying Either an Occult Rune-d or Bloody Rune-imbued Greek Fire +10 (Refined Lv.) plus 82 Str. Requirement for Greek Fire as well as Maxed out Dexterity will Kill Anything, hop on the fastest horse you're good to go. Diana, the Princess of the South Horde's Meteor Strike skill with the Best Katar (+10 Refined Lvl.) from her Capital City imbued with either Occult or if you don't have, Bloody Rune are good.
The Guillotine Blade is NOT Instant Kill! Those that are used by the NPC Ninjas casted on You. It's about 99% Hp cutdown. You need to heal fast. If you have too much Hp, get one of those Hits then move away as you heal. Then attack. Repeat.
The 2nd Throwing Weapon Skill, "Fast Throwing" skill throws a weapon 3 times and fast. With the fastest horse and this either Occult Rune'd or Bloody Rune'd Greek Fire +10 Refined stage, THERE WILL BE NO ONE LEFT STANDING before you.
If you're going for the Hard Badge, there's a very easy way to do this. Start as a character that has Special Ability for Throwing Weapons. Raise some Strength (to 83-85?). Raise the 2nd Throwing Weapon skill to the Max. Do some rogues missions until you have around 20k Gold. Get the best secondary weapon you could get from your starting nation from its Capital City. Sail to the southwest Republic Trades Kingdom (or whatever, you know what I mean). Go to Caesarea the Capital City of the Southwestern Republic Kingdom of Trades, buy Greek Fire. If you're unable to use it yet, go to similar cities and buy the Oil. Refine to 10+. If you get frustrated easy at breaking items, do Save, Load, & Reload tricks. Forge. If you haven't gotten an Occult Rune by a random chance, imbue your weapon with a Bloody Rune that ignores opponent's defence. Now hop on the fastest horse (that costs 100k? I forgot, but it is available in capital cities of every nation).