Stone of Change

Found:
 * Outside The Marketplace Bank
 * Just to the right of the entrance to the tower of The Twelve

You can perform the following actions at the Stone of Change:
 * Attuning an item (see Attuned)
 * Adamantine Ritual
 * Combining Dragon Shards (see Stone of Change - Recipes)

Other "Eldritch Devices":
 * Altar of Fecundity
 * Altar of Invasion
 * Altar of Subjugation
 * Altar of Devestation