Since many new villains are confused with the layout of the Hall of Doom, I decided to come up with a couple of maps for your navigating pleasure =)
The Respec Area
Most people are confused when they want to go to the respec area and instead they see the phase shifter where the respec area is supposed to be on the map. This is because they (and the phase shifter) are on the upper level and the respec area is on the lower level. You can reach the lower level by going to any of the wings (meta/magic/tech) and going down the lower ramp to a large circular ring (the Pit). The respec area is located north of the Pit.
There are 2 locations in the Hall of Doom where you can access the bank. The easiest way to find them is to start in the Meta Wing. Starting at the vendor named Chugon, face north and look for a small corridor located (to your north east or north west) that leads upwards. Follow this and it should take you to the bank.