Ability Tier Activation The user can unlock new sets of abilities that are part of the user. Unlocking can happen via training, experience and/or various empowering circumstances. Most users are limited to specific sets related to their nature and function ("class"), while some especially flexible users can learn very different sets. Talented absorbers and replicators notably can gain not only their targets' current abilities, but also their potential evolutions ("ability tree"). IE: User is a video game character who gets stronger and stronger the more they fight, kill, or complete quests for other individuals.