Completing Group Progression in the first four themes will grant access to Korafax. For each of the first four themes you complete, you’ll be granted access to the next Void zone (B, C, D, and E). You can do the first four themes in any order. Once you have have access to Korafax, you can do the progression there for Void F. Clearing Tower of Discord grants access to Void G.

Note: If you are on a server where Korafax is unlocked without doing progression, then you won’t get access to Void F unless you have done all prior themes.