Each Hero Class has their own unique Talent Grid in which a Player can customize their Heroes attributes.
The Talent Grid can be accessed by clicking 'Talent Grid' on the bottom of the Hero once it has reached it's maximum Ascension tier and level.
To advance through the Talent Grid, you need Emblems relative to the Hero Class you are accessing.
If you need to reset a Heroes Talent Grid, there is a reset button. You can use a Reset Emblem or gems to reset a Talent Grid. Reset Tokens can be used for a reset with no gem cost or Emblem penalties.