missile launchers are the best defense because of very high damage + very high range and (if upgraded) can shoot multiple missiles at a time. It's only vulnerability is the yellow ringer
barons easy if your bio just keep disrupting focus and when the focus is at 0 he will cast deep burning on himself recovering focus for massive hp and when you see he has holy scars put teammates on aggressive and hit him hard also if you have timing and luck you can trigger deep burning while he has holy scars boosting the already super-big damage to about 40,000
just spread out the weight by building connectors underneath your walk. connectors support better when they are connected to the walls so use them for the sides of your bridge. and remember that if the supporting works on one side it will work on the other side so make mirror copies on each side.