Timepiece of Chronos

The Timepiece of Chronos is an ancient relic created by Chronos.  In the Dawn War, he remained largely aloof of the conflict between the primordials and the Nawirrûs Covenant.  He was more interested in tinkering, inventing, and doing things of much smaller scale than getting involved in world and plane spanning enterprises like the Dawn War. 

Timepiece of Chronos

In the God Era, the primordials were no longer much of concern to the angels and gods holding the Prime Material Plane.  They now had to deal with hordes of demons seeking to carve out areas of the Prime Material Plane for themselves.  One theater of the Demon Spawn War was Hells Womb and her Underdark belly Drarthiel.  Demogorgon and his hordes sought to take Hells Womb, while his ally worked to take Drarthiel.  Demogorgon was knocked out the conflict when his egg-like transport was destroyed at Ladneg.  In the dark reaches under Hells Womb, the other demon lord had an army of seemingly endless numbers.  These demons came to this realm through a rift between the planes called the Arioch Cloud. 

The angels at Phollûmâ decided that they need to do something about the Arioch Cloud.  If this gate was anything like the Sôvuk Sea Gate then they would be hard pressed to take it down by force.  The chief intelligence officer at Phollûmâ was sent to meet with Loki and come up with a more clandestine plan for sealing the inter-planar gate.  Loki gave the Phollûmâ officer a device he "borrowed" from Chronos and told him that it must be taken into the rift and activated by someone willing to give themselves up for the cause. 

An elven angel named Marindecar volunteered for the task of going into the rift.  She activated the Timepiece of Chronos by giving up her divine energy.  The device not only froze the angel in time, but ended up freezing the entire Abyssal plane Arioch in timelessness.