Abilities may be upgraded in the Yard. Upgraded Abilities are more powerful than their base versions, with potential improvements such as increasing damage, reducing Heroism costs, or adding new mechanics. Upgraded Abilities display have a different visual appearance than their base counterparts.
Upgrading a Card has two costs. First, the player must possess duplicates of the Card to be upgraded, which will be consumed in the process of creating the upgraded Card. Essence is also used in the upgrade process, with the type of Essence used depending on the Card.
Completing an upgrade also rewards Training XP.