The Staff of the Living Tribunal
While this film introduced a lot of mystical elements from the comics, there’s one specific item that is named dropped by Mordo – The Staff of the Living Tribunal. He puts it to use while training Strange, and beats him pretty quickly, because it is an all-powerful weapon.
In the comics, the Living Tribunal was an actual cosmic entity, who oversaw and maintained balance among the planets and multiverse, and judged them accordingly. Given that the staff belonged to a cosmic entity, speaks to the power that anyone who can harness the staff, has.
Also, given that the relic has to choose it’s wielder, much like the cape choose strange, doesn’t bode well for how the universe is gonna turn out if Mordo gets his way.