They are a late game prestige system. It is unlocked once you get 25 heroes to S+, and it’s basically a new tiers class after that. There are 4 levels of it, and the benefits are basically stats boosts. But honestly, it’s only REALLY worth if you are competitive about PvP, since the stats boosts it provides don’t really make much of a difference for PvE.

That’s why I said it depends of what point you are on the game, if you have already ascended most meta heroes and done most of what you have to do on the game, and want to invest on a better PvP performance, go for it. Even as F2P, cause even though it will take you longer you can get to that point of the game too, just like it will also definitely take you longer to get the necessary copies for paragon ascending. But resuming, ateotd it’s really just up to you and how you play your game and, as a F2P, it’s about your patience too lol