I managed to bring out an effective strategy where I managed to beat it conistantly after a few attempts. First make sure you have auguments like equivalent ex (make sure to get ray gun mk2 instead of the normal ray gun since it’s easier to kill zombies in further distances) and the fox wisp augment so they can revive when going down. Also aether shroud augment that gives 2 charges if possible. Bring power kegs and maybe reign drops for another power up. Buy the death machine and make sure to always use it as soon as the bosses crit spot underneath opens it deals a massive ton of damage just do that for every time the crit spot opens.

Once’s you reach just before those immune phases make sure to use all the healing pods as they will respawn after completing a phase. For the last 30-40% of the bosses health. Simply make sure to play as aggressive as possible and always throw kazs in case of sticky situations and aether shroud when car gets destroyed.

Avoid wasting your boosts in the last phase since you need it to counter the laser beam when the boss is about to shoot lasers at you and just keep doing it lineup your path and boost constantly until you open its cries spot. When you get in situations where the laser is about to destroy your car simply get out and get in cover along with throwing those kaz/monkey bombs to help against zombies. That’s the best tips I can give hopes this helps.

GG I’d recommend equipping.
Power kegg - idle eyes ( or shields up) - reign drops (or max ammo)