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.
The abilities you get depends on your conversations with Eothas and other Gods.
(Chose Eothas! Stop in the first encounter with Eothas)
(Chose Reach for Lost Souls in the first encounter with Eothas)
(Chose Search for your soul in the first encounter with Eothas)
(Upgraded from Symphathy of the Lost after third encounter with Eothas)
(Upgraded from Chorus of the Lost after third encounter with Eothas)
(Upgraded from No Pity for the Lost after third encounter with Eothas)
(Answer Aggressive or all Passionate)
(Answer 2x Clever +1x Diplomatic)
(Answer Passionate + Clever on the first two options, after that don't select any more disposition answers)
(Have Ire first: Answer Clever and Shady. Have Wit first: Answer Aggressive and Passionate)
(Have Ire first: Answer only Passionate. Have Mien first: Answer Passionate / Aggressive)
(Answer Clever and Shady. )
(Depends on what you had after the second talk.)