Common Knowledge!!

As the knowledge of dueling , the thing u needed are Assumptio , EDP and Enchant Element!!
Assumptio scroll could buy from mall , while EDP , Enchant Deadly Poison mostly only for sinx
but if u are without the sinx character , u could use Dark Angel Wing for enchant but only for a moment . EDP could make ur damage high to ur foe so is very important in dueling .
About Enchant Element, there are 4 type of element , which are lightning , fire , water and earth.
Those scroll also could purchase from mall too . Element are important too cause when enemy who use deviling or raydric which make neutral resist for them self and damage them with defferent element so the neutral will usless.