The Dracolich is an undead dragon with a soul Gem phylactery, it has the properties of whatever dragon corpse it is animating, as well as some of the abilities of the lich.
The dracolich (night dragon) first appears in the article "The Cult of the Dragon," by Ed Greenwood, in Dragon #110 (June 1986),[2] and then in the Forgotten Realms accessory Waterdeep and the North (1987).