D&D 5E (2014) Doubling back for features you passed up?

[ccs]

RAW? What you want is called Wish.

Otherwise, talk to and work with your DM/Players & make up whatever fits your game.

 

[MonkeyWrench]

This is probably closest to what I had in mind. It's not so much that I was planning some offense-only build, it just seemed weird that a ranger who picks Horde Breaker will NEVER get the Colossus Slayer ability.

It's especially nice for MC characters as it allows them to get signature class abilities they missed out on at earlier levels.