yeah u need lv 60 knight with his 1st combo buff, ranger about lv75 with angelic might and element fortitude, lv 75 sorc with dark metabolism. If you have these 3 twink for start you will have a lots of hp and dmg both pure dmg and ele dmg for grind.
If you have more high lvl char u should use a lv 79 ele with her strike mark and battle cry.
Maybe archer but I'm not sure.
GL