Dragons live a long time, but they are still mortal, and one day they will die. For some dragons, this is an unacceptable state of affairs - and so they use dark rituals and unholy pacts to consume themselves, bind their souls to precious gemstones, and take on many of the properties of a lich.
Due to their innately evil nature, dracoliches tend to be of chromatic dragon stock, and look mostly like they did in life - just, y'know, more skeletal and/or mold-covered. Dracoliches retain all of their living abilities (like breath weapons, flight, frightful presence, and so on), but gain all of the usual undead immunities and vulnerabilities (poison, charm, paralysis, etc.). Most DMs will also throw in the ability to control undead too; they are a lich after all, and what self respecting undead dragon lord doesn't want an entourage of dragon-guard wights?
One important difference between a dracolich and a regular lich is that a dragon's body is too magically potent to just regenerate around a phylactery. A dracolich's undying soul needs a suitable corpse to possess if its physical form is destroyed, and so they must locate their phylactery near a source of dead dragons. This could be either an existing dragon graveyard, or they could be hunting their peers to build a kind of dragon body farm. Either way, there's your sweet campaign hook. Remember, Gentle Repose works on dragons.
In Pathfinder, they're a lot nastier; known as "Ravener" here (because Dracolich is trademarked), they're soul-eating monsters who pretty much exist to fuck shit up.
Most important in the Forgotten Realms; the Cult of the Dragon, a crazy cult headed by an uber-crazy lich named Sammaster, goes around creating dracoliches because they want to fulfil a prophecy in which dracoliches will conquer the world. Why? Um... mostly because Sammaster wants to prove that he translated the prophecy right and everybody else, who says it actually reads as a prophecy about dragons taking over the world after a great apocalypse, is wrong. The absolute stupidity of this whole scheme has been nodded to by various authors over the years.
|This article or section is about Monstergirls (or a monster that is frequently depicted as a Monstergirl), something that /tg/ widely considers to be the purest form of awesome. Expect PROMOTIONS! and /d/elight in equal measure, often with drawfaggotry or writefaggotry to match.|
The closest thing to an example of one known to /tg/ is the Dragon Zombie of the Monster Girl Encyclopedia; if a Dragon fails to find a husband before she dies, the dark energies permeating the world will reanimate her as a Dragon Zombie, a corpse-colored (blue-gray skin, dark mold-green wings, white hair) dragon with bony scales. In this state, her mind has degenerated, leaving her a horny bimbo obsessed with finding a man and taking him for her mate. These dragon-girls are quite dangerous, because they possess a "rotten breath" attack that can convert human women into undead monstergirls.