Those are rankings which can be achieved after hitting lvl 95. You earn them by doing a certain quest or more quests and get this rankings at every 5 lvls after 95 (100, 105, ..) .. the difference is the blue glow, also the zerk time is getting for every higher rank longer and additional .. if two 95+ players open zerk at the same time in a party, they turn from blue to red and do again 20%+ more damage.
€dit: You can also buy Zerk potions from the pot lady and use one of them every 20 minutes (there is a cooldown time).
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