Oliver Queen made a major gamble during the Arrowverse's three-show crossover "Elseworlds," but don't expect to find out what that was in Arrow Season 7. According to showrunner Beth Schwartz, the fallout from that decision will be explored next season, but not this one.
Asked how Oliver's deal with the Monitor will impact Arrow this season, Schwartz told CBR, "That will more impact him next season, so it's not really... This season, we're not going to see too much of that."
During the final episode of "Elseworlds," Superman got his hands on the Book of Destiny and saw a terrible truth. As he revealed to Barry, Kara and Oliver, Barry and Kara would die trying to save the world if they continued on their chosen path. Like the heroes they are, Barry and Kara tried anyway -- and would have died, if Oliver had not intervened.
As Barry and Kara raced in opposite directions to slow down the Earth's rotation, Oliver paid the Monitor a visit to vouch for them and save their lives. "The universe is complex piece of machinery and balance must be maintained. One change requires another. How would you propose I keep the balance?" the Monitor replied. Though the scene cut back to Oliver, his answer wasn't shown. However, the Monitor gave Oliver the weapon he needed to stop John Deegan, which means he bargained something in exchange for Barry and Kara's lives. We just won't find out exactly what that was until next season, likely during the "Crisis on Infinite Earths" event.
Airing Mondays at 8 pm ET/PT on The CW, Arrow stars Stephen Amell as Oliver Queen, David Ramsey as John Diggle, Emily Bett Rickards as Felicity Smoak, Rick Gonzalez as Wild Dog, Echo Kellum as Mr. Terrific, Juliana Harkavy as Black Canary, Colton Haynes as Arsenal, Kirk Acevedo as Diaz, and Katie Cassidy as Black Siren. The series returns for the back half of Season 7 on Jan. 21.