Here is a tip about killing lvl 30 and not getting rogue, well you will get rogue but you will turn back to normal in 1 sec.
OK this is what you do, you take an meta potion that has a lot off attack power, you transform into that animal and go attack your target when you kill him you will get rogue but when you cancel your pot you will be back to normal whit out any Rogue points. But i have to worn you this is considered as a ban for 1 day in Archlord so be careful when you do it.
Hope this helped.