On Floor 3 and Floor 6 (and floors 9, 12, 15 and 18 on Twisting Corridors), you will find a Broker who sells you Anima Powers and special items for your
Phantasma. However, that's not all as the Broker will have a Blue Bubble around them which allows you to change your talents and gear.
In normal wings, using the
Ravenous Anima Cell on
Broker Ve'ken on Floor 3 can be useful if you already bought everything from him, as you can get Phantasma via
Broker's Purse to help you prepare against the final boss fight via having more wares from
Broker Ve'nott on Floor 6. However,
DO NOT DO THIS ON TWISTING CORRIDORS! In Twisting Corridors, the Brokers appear in more than one floor, and killing one early on will make it so it doesn't spawn for the rest of the run.