Dual-Blade

hey, I just recently made a dual-blade not knowing your not suppose to use your SP you get as a theif. So I was wondering does that all reset at level 20 or would I need to restart my character?

Just restart if you're so worried about it. It's beyond easy to reach Lv20 on a Dual Blade anyway; I actually had to go kill myself over 10 times just to advance at Lv20 without levelling up to Lv21.