(Spoilers ahead for the full series, obviously.)
He summoned the Empty by achieving true happiness and telling Dean he loved him.
Jack (Alexander Calvert)
He’s God now, y’all!

Katie Yu/The CW (2); Bettina Strauss/The CW (2); Dean Buscher/The CW; Robert Falconer/The CW
He was told that Benny (Ty Olsson) had been killed by his own kind.
Kevin Tran (Osric Chau)
The good news?
Kevin (Osric Chau) got out of hell.

Robert Falconer/The CW
(Could she be the woman Sam ended up marrying?)
Garth (DJ Qualls)
Garth (DJ Qualls) got a particularly happy ending.
And the Empty is where we left her.

Robert Falconer/The CW
So we’re going to assume she’s now happily working for Jack … maybe?
And when Jack stole Chuck’s powers, she became one with Jack.
According to Jack, they exist in harmony.

Katie Yu/The CW
Little did he know, that wound was fatal (meaning he’s killed two different Deaths now).
This time she was working for God, but in the end, Michael reduced her to dust.
But it didn’t work, and Chuck killed him.

Katie Yu/The CW

Michael Courtney/The CW

Dean Buscher/The CW

Liane Hentscher/The CW

Colin Bentley/The CW

Dean Buscher/The CW

Michael Courtney/The CW

Bettina Strauss/The CW

Colin Bentley/The CW

Bettina Strauss/The CW

Katie Yu/The CW

Katie Yu/The CW

Jeff Weddell/The CW

Bettina Strauss/The CW

Colin Bentley/The CW

Dean Buscher/The CW

Michael Courtney/The CW

Bettina Strauss/The CW