IN Final Boss node 12

The way to break nodes in GW is to increase your arena power. I can't remember the specific numbers so I apologize if these are off. 50-52k will break node 12, above 52k will break 11 and 12, and I can't remember after that. It's the reason why node 12 teams are so tanky. Those players threw all their protection mods on their tanks to increase their power and won one arena match so that they could break more nodes and make your life difficult.