S11·E1 Out of the Darkness, Into the Fire

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S11E1 (Out of the Darkness, Into the Fire).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
No inventing/guessing titles, names, dates, counts, awards, ratings, etc.
If a detail is missing, omit it.
Style: Original, neutral, encyclopedic prose, plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
Synopsis: Picking up where the finale left off, Sam and Dean must deal with the Darkness that has been unleashed. Castiel deals with the effects of Rowena’s spell and recalls his brutal battle with Crowley.
Sources:
[1] TMDB: Series title Supernatural (2005).
[2] Wikipedia: Created by Eric Kripke. Broadcast on The WB and later The CW for 15 seasons (Sept 13, 2005, to Nov 19, 2020). Follows Sam (Jared Padalecki) and Dean (Jensen Ackles).
[3] IMDb: Cast and crew info.
[4] TMDB: Sam and Dean Winchester lost their mother to a mysterious and demonic supernatural force. Their father raised them to be soldiers to kill paranormal evil.
[5] Simple English Wikipedia: Horror, drama, fantasy, fiction series.
Episode Title: Out of the Darkness, Into the Fire.
Season/Episode: S11E1.
Characters: Sam Winchester (Jared Padalecki), Dean Winchester (Jensen Ackles), Castiel, Rowena, Crowley.
Plot Points:
Picking up where the finale left off.
Sam and Dean deal with the unleashed Darkness.
Castiel deals with the effects of Rowena's spell.
Castiel recalls his brutal battle with Crowley.
Series Context:
Created by Eric Kripke.
Genre: Drama, mystery, sci-fi, fantasy, horror.
Sam and Dean lost their mother to a demonic supernatural force.
Their father raised them to hunt paranormal evil.
Constraint Check: The synopsis is extremely short. The sources provide context about the series but very little about this specific episode beyond the synopsis.
Problem: The word count requirement is 280-380 words. The available facts for this specific episode are:
1. Sam and Dean deal with the Darkness.
2. Castiel deals with Rowena's spell.
3.