this is a old trick, but very usefull to kill queen ant!
1.take your char... put in him all ekips u have... (for exemple i will use a DY robe and arcana mace acumen!)
2. go to the grand master and take a sub class (eg. warlok) go to ur passive skill, u will see the grade penalty icon!
3. cancel this sub class and take other(eg. sorcer, cause this is the best class to kill queen ant) ok! now see the passive skill and u dont have more grade penalty!
this bug work in a lot of servers!
enjoy!