When you choose your clan, you will start with a passive ability unique to each clan. You can then unlock abilities from the Ability Tree, starting with your chosen clan.
Each ability requires spending Ability Points to unlock, which are earned from completing missions, combat, and exploration. At the peak of the Ability Tree, you can unlock the clan Perk, a reward to those dedicated enough to unlock all of the abilities for a clan, giving a permanent passive upgrade.
Flesh of Marble
Clan Passive: Feeding hardens your skin, making you highly resistant to damage.
Cloud Memory
Cause a target to forget you were there, putting them into a relaxed state.
Possession
Possess an opponent, allowing you to see through their eyes for a period. While possessed, the target can be commanded to attack another person.
Terminal Decree
Use your powers of Dominate to command someone to kill themselves.
Mass Manipulation
Subdues enemies within your gaze, preventing them from attacking. Dominate abilities will affect all subdued opponents while Mass Manipulation is active.
Resilience
Clan Perk: Increases the amount of health restored by feeding.