The Yard is where Heroes train for battle under the guidance and razor-sharp expertise of Blade. It allows you to combine, upgrade, and modify Hero Abilities, as well as participate in sparring matches which increase Heroes' combat prowess and bonds with the Hunter. Upgrades add a new, beneficial effect to an Ability, such as giving it a status effect or increasing its attack damage.
Upgrades to the Yard provide additional training opportunities that unlock unique benefits for combat, such as applying a random Mod to an upgraded Ability. While Abilities have a predetermined upgrade effect, Mods are randomly applied from a vast pool of benefits, and any Hero Ability can potentially get any Mod.