- Not to be confused with the music track "Solstice"
On March 27, 2017, a "bonus chapter" was released that affected NG+ runs. In this update, the Solstice chapter and ending is added and previously inaccessible areas (past the mine in the Barrens, the graveyard in the Glen, and the countdown door in Refuge) are made accessible through the use of the journal, with the exception of the countdown door as it uses the password "SOLSTICE" instead of using the journal.
|“[You are going out of bounds.]”|
|WARNING! The following section contains Solstice spoilers. If you haven't played OneShot nor have done a Solstice run yet or if you wish not to be heavily spoiled, feel free to turn away from this section.|
To start the Solstice chapter, the Player should be doing an NG+ run and currently in the Barrens (If the player is in an NG+ run and past the Barrens, they could prematurely reset their run by having Niko sleep in the bed inside the countdown door's room). If the Player lets Niko enter the mines, go to the once-inaccessible area there, and talks to Proto. The Solstice chapter begins and the run is locked onto it (the run can no longer go its normal route).
During the run, significant characters like Silver, Calamus, Alula, and the Lamplighter get caught up in squares. Once accessible areas become inaccessible also because of the squares, restricting the Player to play the path Solstice was intended to. Through the chapter, Niko, Proto, Rue, and Cedric put forth the plan that was intended to gain a happy ending. With the chapter concluding on Niko conversing with the World Machine, the sun returning to its rightful place, and Niko returning home.