On paper, it seems like hybridding arkvulcan and vulkan would be the best Omega tanking setup for the part breaking, wound inflicting, weak point targetting, fire res, healing off wound breaks and weapon spams, and high defense. Maybe with a dragon sword and shield so you can actually dodge, and dragon element is equal to thunder damage to the Omega's head but the armor boosts dragon element damage woth Convert Damage. I'm thinking the devs purposely made the Omega head weak to Dragon so the tank player could use arkvulcan and dragon to deal extra damage to the head which is the weakpoint for more shields and wound breaks. I'm not sure though.