I thought 17-20th level was epic.
It definitely is for me, but I think the truth is that some people want an option for not having an upper level bound (like 3e epic rules or BECMI immortal rules).
On a related note is anything going to come of prestige classes/paragon paths//epic densities in 5e - or have 5e feats essentially taken over?
It' yet undefined/undecided as far as we know. They
might add some system of prestige classes et simili in the future.
In the meantime, for your own custom material,
feats are not the only way to represent previous editions' PrCls and 4e high-level archetypes, and definitely are not always the best way. There is also subclasses, and you can also easily define 3e-type prestige classes for 5e without the 5e books telling you how to do that.
I've written before how the 3 methods all have merits and drawbacks, and I am going to use
all of them probably in my 5e conversion of Rokugan. It's just a matter of understanding which suits better each specific character concept, or (if converting) each specific prestige class/paragon path/epic destiny from a previous edition.
For example, I have many 3e books, and if I want to convert a prestige class to 5e, I'm going to take a look at these:
- How many and what are the
unique special abilities granted? These are the most important features that define such prestige class! If they are very few, chances are you can stuff them into a single feat, or a 2-3 feats chain.
- Does the prestige class grant progression in a base spellcasting class? Then it is meant as a continuation/extension/specialization of that class, so probably you are best to turn this in a subclass of that class.
- But regarding to the previous point, sometimes it's meant to be applied to both Wizard and Sorcerer, or to both Cleric and Druid, and in some case it might even be suitable to
all spellcasters. Then a feat chain or an actual "5e prestige class" will work better.
- Consider also that subclasses always start early, 1-3rd level. That might mean not very "prestigious". Also, someone might have already picked a subclass when it's time in the story to join the prestigious group. In this case, consider allowing the "subclass mixing" option in the DMG.
- Sometimes there is a 3e prestige class that's really 10 levels full of unique benefits, which follow a clear progression. Then a subclass (usually 3-5 levels worth) or a feat chain (4-7 per PC) may not be enough to cover it all, especially if you want to see someone "complete" the prestige class before too high level. Then you really should introduce it as a full-fledged prestige class.
This is all about your own home campaign material, so you don't have to abide to any design rule! For instance, just because 3e prestige classes followed some pattern in requirements and progression, you are free to ignore them and do what serves your game! Also, 5e prestige classes will be EASY to design because you don't have to worry about BAB, ST, and spellcasting progressions.