To ensure that you are ready to walk the path of the duel swordsman you first have to show your spirit is worthy with an act of ritual honour that will focus the flow of chi to your dantien and treble the power of your sword skills.
You need to do this because duel swords is a level 30 skill, so the ritual (a glitch if you will) is the only quick route to bypassing levels 1 to 29 so that you can begin at level 30 as quick as possible.
A quick search on Ebay should bring up many sources for Ninja Gaiden Sigma style weapons. Once you win the bids and get them through the post, what you need to do to access level 30 power is wash your body and in the nude, oil yourself with olive oil from the neck down.
Light a fire and place the blade in the fire (you can use a stove if you want) once its real hot, you need to place the blade on the ground and then while praying for the sword spirits to imbue you with their powers, sit down in a cross leggedposition on the blade and allow it to press into your buttocks.
Sit through the pain and after it subsides you will feel the energy of level 30 and have the markings to prove your skill level to any other level 30 swordsman you may meet.
Before a duel the baring of buttocks and presentation of your markings for close scrutiny is the correct ritual for level 30 swordsmen. Never duel in public, its best done at night and preferably in secluded spots like parks with bushes and maybe gents toilets etc.
hope that helps!
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Sweat more now, bleed less later.
"Unreasonable and reckless rogues, whose heated brain is not to be calmed by reason, expose themselves easily to the gravest danger" | 
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