Where do I go after Brother Eli?

[Mister Shan]

I just beat Little Johnny and then Brother Eli but I am not sure what to do next. I found the entrance underground and they gave me a quest to find AID armor pieces but I am not sure where to farm that and even if that is the next thing I should be doing. Please help.

[Necroscourge]

Fight your way to Gideon's Rock, specifically the Cloud 9 Bar.