Borderlands 2 Cheats[ PS3 ]
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Secret - The Warrior Trick
When you first enter the area, go to the place where jack and lilth would be and off to the left is sheltered area with a ammo deposit behind it. if you go under the shelter, the warrior cannot reach you with any of its attacks (providing its on the side opposite to the shelter) so you can just unload bullets into the thing. But if the warrior pops up beside you, take cover behind the pillar and his fire breath will not hit you. You also do not need to worry about getting to higher ground when the lava rises since the lava can't reach you.
The only thing you need to worry about is the flame cyrstalists since they can and will knock you into the lava with one of their attacks.
I really do hope that this helps you defeat the warrior a bit easier.
Thanks for reading