dracolich — a dragon that has been turned undead and given lichdom. These monsters retain the savage physical attacks of dragons and gain undead resistances and various other powers depending upon (1) at what age they were converted to dracoliches, and (2) how long they have been a dracolich.
The Cult of the Dragon is usually responsible for a dragon becoming a dracolich, although some dragons have sought ought the process on their own for various reasons.
A dracolich has 19 HD, minimum, even if it had fewer hit dice in life. A dracolich has 250 HP minimum, even if it had fewer in life. Dracoliches have 40% Magic Resistance, but bear in mind that this percentage is relative to their overall HD, and will be adjusted upward or downward for an opponent who is more powerful or less powerful (compare the dracolich's HD to the opponent's OVL).
Dracoliches do not possess Damage Reduction. However, they are immune to non-magical melee attacks. Even when attacked by magical weapons, they have resistance to piercing and slashing weapons (but full vulnerability to bludgeoning attacks).
Dracoliches do not possess regeneration, as they are not living creatures.
A dracolich loses the powerful breath weapon it had in life, but gains Cone of Death. This ability replaces any Lair Actions it had in life. A dracolich normally prefers to use Cone of Death during each of its opponents' combat turns; but, it will release chain lightning instead if two or more opponents appear weak, badly injured, or are too far apart from one another for the dracolich to catch at least two within its Cone of Death.
If it notes that one or more foes appear resistant or immune to either of these attacks, a dracolich is wily enough to substitute some other powerful spell effect. At will on its foes' turn, a dracolich may choose to substitute one of these effects for chain lightning or cone of death: fireball or cone of ice for 10d6+HD.
A dracolich may use Necropivot once during a combat encounter. If it fails to activate it successfully, it may try again as many times as needed, once per round on its turn, until it has succeeded once. It will attempt to use this ability before losing a total of 200+ HP in the encounter. When a dracolich has successfully used Necropivot, the crawling lightning in and around its bones changes from an incandescent blue to a sickly purple color.
Cone of Death: a 30° cone erupts from the dracolich's maw and extends up to sixty feet. Anyone caught within this cone suffers 3d12 points of negative energy damage. Save versus Death for half-damage. For every 5 points of damage inflicted (or portion thereof), a victim loses one point of STR and CON. A sufficiently advanced Thief suffers half or no damage. The dracolich regains one HP for every point of ability damage inflicted by this special attack (add up the ability score damage suffered across multiple victims). If Larry, Moe, and Curly each lose 2 STR and 2 CON apiece, the dracolich gains 12 HP.
Chain Lightning: If a dracolich releases chain lightning on its foes' turn, the initial target sustains electrical damage equal to 10d6 plus the dracolich's HD (may save vs spells for half damage). Secondary targets are struck once only as the bolt arcs to each other foe successively if each is within thirty feet of the previous target. Secondary targets take half as much as the full rolled damage (or half of that on a successful saving throw versus spell).
At the start of it's foes' combat turn, a dracolich will 90% of the time use its Cone of Death breath weapon, only opting for chain lightning 10% of the time.
A dracolich's saving throws are per a 19th level magic-user.