NUIQUE
2
Welcome to the forum @queloune
You are definitely referring to ascension.
If you have problem with gold, get the “Dealer” perk. This will give you a lot of gold from selling loot.
If you have no problem with gold, then go for “Accomplished”/“Enshrined”. Either will give you better loots faster than if you do not have either.
With regard to mythic, it has something to do with your intended build.
You should check this:
I hope this helps.