Watcher Abilities in Pillars of Eternity 2: Deadfire are actions that may only be performed by the Main Character (the watcher). All abilities are divided into active and passive abilities.
Screenshot of 2 known abilities: https://imgur.com/a/4JtdgIB
Your second ability will depend on your response in the scripted interaction with Eothas in the Arena at Port Maje:
will grant you Chorus of the Lost - Distracted&Hobbled (Foe AoE: 2,5m radius)
-Search for your Soul.
will give you No Pity of the Lost - Distracted (Foe AoE: 2,5m radius; Steadfast Inspiration on Self)
- Reach for Lost Souls.
Will give Sympathy for the Lost - Distracted (Foe AoE: 2,5m Radius); Heal 35[Base] (Ally AoE: 2,5m Radius)