1:easy way and cheaper(trojan/water) or (RB class with robot/fishy)
-w8 for your exp skill robot/fishy to appear then stand on the middle of 2 stakes then activate ur robot/fishy then attack 1 stake either on your left or on your right doesnt really matters...w8 until robot/fishy run out and then your gonna notice that your attacking on the middle of 2 stakes and when rage activated it will hit two stakes!
2:EXPENSIVE way but for all class(no need to RB)
-go get your self a Night Devil scroll !! its cost like 30kk on my server i dont know on yours! but anyways... you can always hunt it out on heavyghost but takes your forever if your unlucky!! and theres this Dis city quest i never been there before but i heared that ND drops are much more higher!!.. so once you get the ND/Night Devil skill... it will be a exp skill so u need to w8 for it to come out and do the same moves as i stated above...