The Bane wrote:
If I don't miss my guess, or at least for me and my use of the phrase "E5", stems from the original concept of E6. Where, indeed levels stopped at 6th level. Advancement continued past 6th level with Feats, and some mentioned using Prestige Classes to go another three levels, or so.
When PFBB came along, E5 kinda sprung up since it stopped at fifth level.
Best,
The Bane
Yep. That's pretty much it. Regular level advancement stops at 5th Level, with characters gaining a new feat for every 5000 XP thereafter. Also, yes, I plan to use prestige classes.