A Sling Ring is a mystical object which enables the wearer to open a dimensional gateway to another location.
Sling Rings are small two-finger rings imbued with the power to create and sustain portals between any two points in the universe, and also, although it requires much effort, throughout the Multiverse as well. They are used by the Masters of the Mystic Arts, and their apprentices, to facilitate long distance travel where a temporary portal is desired. Sling Rings are typically worn on the left hand when conjuring a portal, and this is achieved by the wearer tracing their right hand in a circular pattern while focusing on a destination beyond the space directly front of them. Most of the time they are simply carried until needed, typically somewhere on a user's belt.
Retrieving the Dark Scepter
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Theft of the Book of Cagliostro
After the Ancient One killed several of the Zealots in the Mirror Dimension, Kaecilius used his Sling Ring to open a portal to flee to a park-like area. The portal closed before the Ancient One could follow. She used her own Sling Ring to travel back to the real world.
Stephen Strange's Training
At first, Doctor Strange found it difficult to use the mystic device, able to only generate orange sparks where his peers were able to summon full portals. As "encouragement" the Ancient One used her Sling Ring to transport Strange to Mount Everest and left him there with his Sling Ring. Strange managed to use his Sling Ring to get back to the Kamar-Taj before he froze to death.
Kaecilius and the Zealots used Sling Rings to travel to the New York Sanctum. When Strange managed to trap Kaecilius in the Crimson Bands of Cyttorak, the Zealot noticed that the amateur sorcerer had lost his Sling Ring, distracting Strange long enough for Lucian to stab Strange.
Doctor Strange used Kaecilius' Sling Ring to open a portal to Metro-General Hospital in search of Christine Palmer to fix his wound from Lucian Aster's attack. In his haste to seek help, he accidentally left the portal open, allowing the Zealots' Astral Form to follow.
After being saved by Palmer and dueling Lucain, Strange led Palmer to the janitor's closet where he showed her the opened portal; after stepping through back to the New York Sanctum, Strange used the Sling Ring to close the portal.
Battle at the Mirror Dimension
During the Battle of the Mirror Dimension, Doctor Strange tried desperately to use his Sling Ring to escape the dimension, only for the Zealots to warp the world around the portal, causing Strange to lose his focus and destroy the portal. The Ancient One used her Sling Ring to enter the alternate reality to duel Kaecilius. Kaecilius let his Zealots attack her before stabbing her and using his own recovered Sling Ring to push her hundreds of stories to the mortal ground below. The sorcerers used their Sling Rings to escape the Mirror Dimension after the battle.
Kaecilius and the remaining Zealots used their Sling Rings to travel to the final Sanctum Sanctorum and destroy it. Doctor Strange and Karl Mordo used their own Sling Rings to travel to the same area. After the battle, Mordo left the Masters of the Mystic Arts and took his Sling Ring with him. Wong and Strange presumably used their Sling Ring to return to Kamar-Taj.
After discovering that Thor and Loki had arrived on Earth, Doctor Strange used his Sling Ring to transport Loki away and to beckon Thor into coming to the New York Sanctum. Following a brief discussion about Odin's exile and Thor's intentions, Strange used a strand of Thor's hair as well as his Sling Ring to create a portal to Norway, where Odin was located. Strange used his Ring a couple more times to bring Loki back and transport the two Asgardians away.
Upon hearing Bruce Banner's warning of Thanos' arrival, Doctor Strange used his Sling Ring to find Tony Stark and bring him in the New York Sanctum. Later, during the fight against Ebony Maw and Cull Obsidian, Strange used his Ring to transport Banner to safety upon seeing that he couldn't turn into the Hulk.
Wong and Strange both used their Sling Rings to redirect Maw's projectile attacks, injuring the alien in the process. Wong used his Sling Ring again to save Stark from being defeated by Obsidian as well as severing the giant's arm in an attempt to trap him. Upon discovering that Strange was abducted, Wong used his Sling Ring to return to the New York Sanctum to protect it in Strange's absence.
After a brief skirmish between the Avengers, Doctor Strange, and the Guardians of the Galaxy, they came up with a plan to subdue Thanos once he arrives on Titan. Strange used his Sling Ring to assist Star-Lord in planting a bomb on Thanos' back, then again to assist Spider-Man in attacking the Titan, but the latter two were subdued in the process. Once the Guardians and the Avengers were able to successfully hold Thanos, Strange used his Sling Ring to transport Mantis on top of the Titan's head to hypnotize him. However, this assault became compromised once Star-Lord found out about Gamora's demise. Once Thanos was able to complete the Infinity Gauntlet, he used it to eradicate half of all life in the universe. Doctor Strange was among the unlucky few to vanish, and his Sling Ring vanished with him.
Before the Battle of Earth started, a Sling Ring portal appeared behind Captain America followed by many other portals. As the portals are created, many fellow Avengers appeared, as well as other armies. Thus, the Battle of Earth began.
- The portals created by the Masters of the Mystic Arts through the Sling Rings shares numerous similarities with the Inter-Dimensional Gate, as they both channel extra-dimensional energy from other dimensions to open a door to a specific place in the Multiverse.
Behind the Scenes
- While most of the magic and artifacts in Doctor Strange are taken straight from the comics, the Sling Ring is an original item created specifically for the Marvel Cinematic Universe. Director Scott Derrickson explained, "The gateways, the forming of the gateways that are used for that, that's straight out of the comics. I just needed an object for them to carry it on."