This new Epic Hero system is a really good concept and without doubt it invigorates the game but the introduction is awful.
I know this isn't the Dynamica thread but I have to talk about him here.
An event dragon is too powerful to be one of the first hero of a class. Dynamica should have been the last(?) Legendary hero and after you could introduce the Epic rarity, with a counter (non-event) hero to Dynamica. And when we have a year's Epic heroes, then you can give us an Epic dragon.
This way the new Epic dragon would break the game less. Also, the players would have experience with Epic heroes.
About the leveling, upgrading, obtaining and stuff...
I don't really understand, what is changed? Why should we pay even more for a single hero because it's Epic? Yes, it's a new rarity but this is still Castle Clash and this is just another new hero....
I don't like we cannot use shards instead of hero copies. You could just change the amount required, for example 100k/hero copies.
As for the Relics, I have no idea yet but I don't want to use hero copies to upgrade them. But it's a good concept.
Relic traits.. I don't think we need the option to lock them, let the luck decide. But I would create an item as an alternative for gem to roll them, like we have for superior traits.
Hero Assist is also a good concept, no need to change it.
About the new items related to Epic heroes.
We will need more and more types of Vestiges, each for every Epic hero introduced. They will consume a lot of space in our Storages so they should be replaced with one item we can use for every Epic hero.
The amount of these required to upgrade is okay, I am sure they will be more available as time passes.
I would make a new Castle Chest for them (also for new Birthrocks) or something like that.