Since several low level players start getting XP in the frontiers on mobs around lvl 12, it is frustrating that lvl 50 players from other realms just come over to camp those spots and kill them off just to grief them. Set a level cap on enemy players that can be attack..say if you hit anybody doing xp in the frontiers that is 10+ levels below your current level, you get blown up like you do in crafting when you overcharge an item. Would be funny as heck to watch and would stop the griefing of those lower level players just trying to enjoy the content the game offers.