What is Dota 2's hero ability augmentation system called?

Dota 2's hero ability augmentation system is called the Talent Tree. Heroes unlock talent choices at set experience levels, allowing players to enhance abilities or gain other bonuses rather than simply learning another standard spell.

The system adds a layer of customization to the same hero. One talent might improve damage, range, health, cooldowns, or utility, while the alternative may support a different role or playstyle. Players therefore choose talents according to the match, their item build, and the threats posed by the opposing lineup.

A common mistake is to confuse talents with the hero's ability icons or with item-based upgrades. Talents are permanent level-based choices for that match, while items are purchased and can be sold or replaced. The Talent Tree also differs from a Rune Page or Perk Board, terms associated with other games.

Because the choices are often presented as pairs, the Talent Tree does not make every hero identical from game to game. It helps explain why two players using the same hero can develop noticeably different strengths.