Here is aguild to plvl ur XP skill Like Robot , WaterElf And ND:
First go to giuld area door hit it u will find ur xp skill coming to fast juts make ur xp skill and hit the door with it when u restore u will find it coming again and soo on......... .
easy right
u can eaven use outo clicker to click on the door and as example make the xp skill in F1 and make it press F1 u can go and sleep and in the morning u will find ur xp skill plvled.
but not good way to sleep may be some one kill u .