Holy shit this fight took my so many tries and my adrenaline has spiked.
A lot of people have posted helpful tips for the boss fight, but these are some useful tips i used for my game tha might help depending on your playstyle:
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I used frenzied guard with longer duration augment and fire from stock augment, especially for the third phase. If tessie is broken and you have frenzied guard, pop it and throw down a kazmir. This makes you basically immortal as long as it's killing zombies, allowing you to repair the car even if missiles are being sent to you. Pair this with a power keg and an arsenal accelerator gobblegum and you should be able to get a few hits off this off in the last phase.
- TRY TO GET ALL OF YOUR PERKS ASAP BEFORE BOSS. If you get all of your perks, all TED trials will give you perma perks (permanent perks that stay if u down) if you reach legendary rewards. This can help you tremendously, especially if you down a lot. PLUS, if the rng gods are on your side like they were for me, you'll hopefully get a Quick Revive perma perk, which will allow you to use all three dying wishes if you have that augment equipped because it won't be removed if you use one, which saved my ass multiple times in the boss.
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This is more of an rng thing but if you can get the ray gun AND the gauntlet, that's a really good setup, the gauntlet does crazy crit damage to the boss in the immune phases and the ray gun is really good for clearing hordes
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vulture aid augment that auto picks armor is really good for boss
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idk if this is common knowledge or not cuz i didnt know about it until I tried but take advantage of tessie's power slide (left bumper) which will help you turn sharply to face the boss or avoid missles without swerving