Ruin

Ruin is a Shard of Adonalsium in residence on Scadrial. Along with Preservation they power the Metallic Arts.

History
Previous to the story in the first mb, Ati had come into an agreement with Leras (bonded to Preservation), to create the planet, in agreement that one day he could have his way with the planet. But Leras wished for more, and so "gave up part of himself" in order to give sentience to the humans on the planet. He knew that Ati would take advantage of this and so imprisoned Ati, reducing his influence on the world.

In the years leading to the formation of the Final Empire, Ruin subtly affected the Terris prophecies, indicating that the person who takes the power at the Well of Ascension should give it up, for the betterment of humanity. Alendi attempts this, but is stopped by Rashek when Kwaan discovers Ruin's alterations. Rashek 'touches' Preservation, and uses the power at the Well to reshape the world, making lots of mistakes.

After a thousand year reign over the Final Empire, Rashek the Lord Ruler is slain by Vin, as both Leras and Ati prepare for the refilling of the Well. Vin accidentally releases Ati from the prison before Sazed discovers Kwaan's warning about the alterations. After Elend's death, Vin and Ati fight to their deaths, and Sazed takes control of both shards.

It is theorised that Hoid sends a letterto Sazed sometime between the Mistborn trilogy and .