A time crystal being studied on Doctari Alpha

A time crystal (or poH qut in Klingonese) was a rare mineral with a non-equilibrium matter state. Time crystals could be identified by their orthogonal indices. To Klingons, at least those outside of Boreth, time crystals were a myth, a symbol of Kahless, and the namesake of Qo'noS. (DIS: "Magic to Make the Sanest Man Go Mad", "Through the Valley of Shadows")

By the mid-23rd century, the Vulcan Academy taught its students about time crystals. No Federation-aligned species had been able to stabilize them as the decay rate of the lattice was too unpredictable, and it was thought that any technology based on time crystals must have been perfected by a four-dimensional race. (DIS: "Magic to Make the Sanest Man Go Mad") Nonetheless, time crystals were encountered a number of times.

Boreth crystals

Time crystals were a rare mineral native to the planet Boreth, and the monastery on the planet was not just built to house the Followers of Kahless, but also to protect the mineral. Guarded by the Timekeepers for generations, the crystals generally did not leave the walls of the monastery. The Klingons did at one point exploit the crystals, but stopped because the power to manipulate time was a weapon unlike any other. (DIS: "Through the Valley of Shadows")

The exploitation of the crystals might be linked with the Klingon experiments with time travel around the 2230s, mentioned in "The Red Angel".

Project Daedalus crystal

A modified time crystal was required to enable the Red Angel time travel suit developed by Section 31 in the 2230s. Based on intelligence from an operative on Qo'noS, Leland learned that one had hit the black market near the Orion outpost and acquired it. On Doctari Alpha, the crystal was given to Gabrielle Burnham, who planned to charge it from the nearby supernova of Alpha Lupi. However, the Klingons tracked the crystal to the colony and attacked, forcing Burnham to install the crystal in the suit prematurely. Burnham used a device which attracted the crystal to install it in the back of the suit rather then using her hands. After Burnham was trapped on Essof IV in 2257, the time crystal in her suit was targeted by Control within Leland's body, causing an explosion. (DIS: "The Red Angel", "Perpetual Infinity", "Through the Valley of Shadows")

Harry Mudd's crystal

A sensor display of Mudd's time crystal

At one point, Harcourt Fenton Mudd acquired a time crystal device capable of creating chronal displacements. This technology consisted of two components: a wrist-mounted crystal with controls in an unknown script, and a much larger one on his ship capable of generating the required energy for chronal displacements.

It was suspected that he used this device to rob a Betazoid bank, and in 2256, during the Federation-Klingon War, he used it to attempt to steal the USS Discovery and sell it to the Klingons. The device on Mudd's wrist disintegrated after he allowed the Discovery to rejoin the time stream. (DIS: "Magic to Make the Sanest Man Go Mad")

AT: "Magic to Make the Sanest Man Go Mad" explained that Mudd's armband was kept in place using magnets as it kept sliding off, and that the display effect was achieved with iPod Nanos. The script seen on it was said to be a countdown.

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