Flamerock Refuge is a new area in Tiny Tina's Assault on Dragon Keep DLC
You get there through the Unassuming Docks of Potentially Little Importance
Flamerock Refuge used to be a really nice place until the Handsome Sorcerer messed everything.
How to get to Flamerock Refuge
Fast travel to Unassuming Docks
Go through the Sandbar of Infrequent Walks and then the Hamlet of Swift Passing Through
Take the entrance to Flamerock Refuge and proceed through the Flamerock Outskirts and you will reach the town.