I need some tips, can’t seem to beat him and A.i is worthless.
Use your team as bait and spam Incineration shots at him, there should be at least one where you fight him.
Using hard light weaponry is the most significant for damage.
I skipped it
You need to use your team mates to distract him and shoot him in the back…whether you do that from close range or distance depends on what weapons you have. Instruct team mates to one side, you go around the other and then order to fire on the Warden. There are decent enough weapons around the map to take care of the annoying soldiers and power weapon on top platform to do the damage to the Warden.
Alternatively you could get lucky…the Warden lunged at one of my team mates and fell off the map! 
> 2533274882937857;2:
> Use your team as bait and spam Incineration shots at him, there should be at least one where you fight him.
Ok, thanks. Gonna try that one!
Idk why I simply said I skipped it.
If you wanna rush past him run quickly to one of the man cannons and go across, but look down and use thrusters to be on top of the large pillar. Wait for it to charge , look at the platform the wardens jumped off and sprint, jump thruster ground pound. Repeat till you get on the platform and just keep walking