In this passage from Oathbringer, Oathbringer, Chapters 62-64: Restoring Urithiru — The Sibling Awakens, readers encounter a pivotal moment that illuminates the novel's central themes.
The coalition that Dalinar is trying to build — a unified force to face the returning Voidbringers — requires him to bring together nations that have legitimate grievances against the Alethi. Several of those grievances are about things Dalinar himself did as the Blackthorn. He must ask people to set aside injuries he personally inflicted, knowing that asking is insufficient and that he cannot offer anything that fully compensates for what was taken.
Oathbringer introduces the Fused — ancient Singers who have returned from death in a state of something like madness. They are not simply villains: they are people who died for their beliefs and came back to find their world transformed beyond recognition. Sanderson uses the Fused to think about what happens when a righteous cause outlasts the conditions that made it righteous.
The Oathgate sequences in Oathbringer — particularly the passage through Shadesmar, the Cognitive Realm — are some of Sanderson's most inventive worldbuilding. Characters move through a version of reality where objects are represented by their cognitive presence rather than their physical form. Sanderson uses this setting to externalize internal states: what a thing means matters here, not just what it is.
Oathbringer is the novel where Dalinar's past is finally shown to the reader, and it is not the past of a hero. The Blackthorn — Dalinar's name in his earlier military career — was responsible for an atrocity: the burning of a city, the murder of civilians, acts done in service of conquest. Sanderson structures the novel so that readers who have admired Dalinar must now sit with the question of whether a person who did those things can be trusted, and whether redemption is possible.