The Time Stone is one of six Infinity Stones created by the Cosmic Entities. It has the power to manipulate time in various ways, such as accelerating, stopping, reversing, and looping it. Agamotto, the first Sorcerer Supreme, discovered the Stone and built the Eye of Agamotto in order to contain and harness its power. The Eye was kept in Kamar-Taj until it was discovered by Doctor Strange, who would later use it to reverse damage in Hong Kong caused by Kaecilius. Strange would then use the Eye to trap Dormammu in a time loop, in order to force Dormammu to spare the Earth and never return. After the threat of Dormammu was stopped, Strange returned the Eye of Agamotto to Kamar-Taj, where he learned of its true nature as an Infinity Stone.
Powers and Stats
Name: The Eye of Agamotto, the Time Stone
Origin: Marvel Cinematic Universe
Classification: Time Infinity Stone, time manipulation device
Wielders: Doctor Strange, is currently being kept in Kamar-Taj
Powers and Abilities: Time Manipulation (Can accelerate, stop, and reverse time, as well as create powerful time loops)
Range: Up to at least multi-city block level (reversed vast destruction in Hong Kong caused by Kaecilius), likely far higher (was implied to potentially be a massive threat to the natural order of the world)