I'm not skilled but you will go down so fast if you go full zerker, due to very low health pool and toughness. Most people in wvw are veterans, keep that in mind. I used to solo roam with core guardian before I changed it to Firebrand support for Zerg. I learned classes that I struggled with and that one class that will always whoop your butt. If you don't have wall of reflection in your utility, you will struggle and lose to Holos, Rangers and Eles. Thief was the most annoying class I've ever encountered. They will run away as soon their hp drops to 25%, and reset combat. Then they will come back for you again. One class I would definitely not! fight is the, Reaper. Core Guardian is a bruiser, Reaper is the better bruiser. Warrior comes second. Yours is a different story, since you're with a team. For me, I would drop radiance, replace it with Virtues. You either want Retaliation or meditation build, can't have both. I suggest having at least 20% concentration, if you go for retaliation. Try this,Zeal 1-2-2, Valor 2 -1-3, and Virtues 2 or 1 or 3-2-3. Your F1, F2, and F3 will all have retaliation. Shield 4 is your main source of Aegis and Retaliation (16 seconds). Optional utilities are "save yourselves" with 15 sec retaliation and Stand Your Ground with 7 second, assuming you have 20% concentration. Lastly, you F3 will become spammable, because of Tenacious Defense trait. edit. I just checked the editor, come to think of it, you can replace one of the traits with Radiance for more damage. Zeal is important for Retaliation build, because of Wrathful Spirit. Aegis will provide you retaliation when it ends. Zealous Blade boost your Greatsword damage . Shattered Aegis is just a cheery on top.