Dr. Strange uses the Crimson Bands of Cyttorak to immobilize Kaecilius while they are fighting in the New York Sanctum.
The bands are a flexible torso shaped device, that look like a bunch of metal ribs attached to a spine. We do not actually know whether this relic has “chosen” Strange or if it simply functions for anyone who wields it correctly. But given its immense power, it definitely qualifies as a relic and opens up the conversation about whether some relics are simply masterless.
On the name
Discussing the bands is made semantically difficult for two reasons. The first is that “they” are multiple bands joined together by a single “spine” and handled in combat like a single thing. So it needn’t be plural “Bands.” That’s like calling a shoe the Running Laces of Reebok. It is an it not a they. Also it is not Crimson. They are not actually named in the film, but authoritative source material indicates that is what these are. So forgive the weirdness, but this post will discuss the bands as a single thing. An it.
So where did it get its plural name? Comic book fans have already noted: In the books, the Crimson Bands of Cyttorak are actually a spell for binding. They are—no surprise—glowing crimson bands of energy, and used by many spellcasters, not just Strange. Here they are in The Uncanny X-Men, cast by the Scarlet Witch and subsequently smashed by Magik.