Series co-showrunner Patrick McKay described Season 3 as intentionally "shaking things up" after linear storytelling in prior seasons, aiming to "surprise the audience" with unexpected narrative choices. The premiere established Middle-earth in a dire state with Sauron waging open war and key characters assuming new roles.
The season featured a gruesome scene depicting Celebrimbor's rotting body hung as a war trophy, a direct adaptation of J.R.R. Tolkien's lore. Meanwhile, Gandalf's encounter with the "Secret Fire" revealed cosmic origins of Middle-earth's supernatural elements through a divine flame manifestation.