I share with you this YT video of a clan (who cannot live without titans jajaja) who found a good way to beat Urrox!.
They used pure OP Titans but it is possible to beat Urrox with Warlocks-Hunters-Titans combined.
If you don't use a Titan with his bubble you can have 1 hunter with invissibility to revive the fallen guardians and keeps in the air with his blade super to avoid the Urrox soil-flames attack and you can mix the next:
-1 hunter with solar and triple jump.
- 1 Warlock solar as well and able to keeps in the air longer and has a meelee attack who protect him with a barrier.
Regards and hope this could help!.
Regards to the author of the video called: Titan Army V2".
"Led Zeppelin Army".
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also second thing is bungie failed hard on designing this fight needs to be nerfed too many adds either have a jumping puzzle boss or an add boss not both nerf that crap