Legendary Resistance (3/Day). If the undying dragon fails a saving throw, it can choose to succeed instead.
Regeneration. The undying dragon regains 20 hit points at the start of its turn. If the undying dragon takes radiant damage this trait doesn't function at the start of the undying dragon's next turn.
Necrotic Body. A creature that touches the undying dragon or hits it with a melee attack while within 5 feet of it takes 5 (1d10) necrotic damage.
Sunlight Sensitivity. While in sunlight, the undying dragon has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Undead Fortitude. If damage reduces the undying dragon to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the undying dragon drops to 1 hit point instead.
Rejuvenation. While its master lives, a destroyed undying dragon gains a new body in 1d10 hours, with all its hit points. The new body appears within 1 mile of the undying dragon's master.
Multiattack. The undying dragon makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 2 (1d4) fire damage and 2 (1d4) necrotic damage.
Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage plus 2 (1d4) fire damage and 2 (1d4) necrotic damage.
Frightful Presence. Each creature of the undying dragon's choice that is within 120 feet of the undying dragon and aware of it must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the undying dragon's Frightful Presence for the next 24 hours.
Breath Weapons (Recharge 5–6). The undying dragon uses one of the following breath weapons.
Fire. The undying dragon exhales fire in a 30-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 56 (16d6) fire damage on a failed save, or half as much damage on a successful one.
Necrotic. The undying dragon exhales necrotic energy in a 60-foot line that is 5 feet wide. Each creature in that line must make a DC 18 Dexterity saving throw, taking 54 (12d8) necrotic damage on a failed save, or half as much damage on a successful one.
The undying dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.
Detect. The undying dragon makes a Wisdom (Perception) check.
Move. The undying dragon moves up to its speed without provoking opportunity attacks.
Tail Attack. The undying dragon makes a tail attack.
Wing Attack (Costs 2 Actions). The undying dragon beats its wings. Each creature within 10 feet of the undying dragon must succeed on a DC 18 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
Bite (Costs 2 Actions). The undying dragon makes one bite attack.
Description
The odor of sulfur and rotten flesh surrounds the dragon. Lacking the scales of a normal dragon, much of its hide is revealed. Or, at least what would be hide. What bits of flesh did not fall off the dragon during its transformation now form large bits of cartilage and bone around the visible muscles and organs of the undying dragon. The exposed flesh steams and bubbles from the fire within the red dragon. Each bubble that pops releases a small green cloud of gas. Where its eyes once were are now sockets filled with green and orange smoke that rise from the empty holes.
Limited Immortality. An undying dragon can’t be destroyed while its master lives. No matter what happens to an undying dragon's body, it re-forms within hours and returns to whatever duty its master assigned.
The undying dragon can serve only evil. If its master finds redemption or sincerely turns away from the path of evil, the undying dragon is permanently destroyed.
Undead Nature. An undying dragon doesn’t require air, food, drink, or sleep.
Lair and Lair Actions
An undying Adult Red Dragon’s Lair
Undying Adult Red Dragon' lair in whatever land they have corrupted and now call home, whether that be a mountain top, captured or lost city, cavern, or graveyard.
Due to the undying dragon's need to corrupt, it does not leave its lair often, instead sending out worshipers or warriors to do it's bidding.
Throughout the lair complex, servants erect monuments to the dragon’s power, telling the grim story of its life, the enemies it has slain, and the nations it has conquered.
Lair Actions
On initiative count 20 (losing initiative ties), the undying dragon takes a lair action to cause one of the following effects; the undying dragon can’t use the same effect two rounds in a row:
- Magma erupts from a point on the ground the undying dragon can see within 120 feet of it, creating a 20-foot-high, 5-foot-radius geyser. Each creature in the geyser’s area must make a DC 15 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.
- A tremor shakes the lair in a 60-foot radius around the undying dragon. Each creature other than the undying dragon on the ground in that area must succeed on a DC 15 Dexterity saving throw or be knocked prone.
- Necrotic gases form a cloud in a 20-foot-radius sphere centered on a point the undying dragon can see within 120 feet of it. The sphere spreads around corners, and its area is lightly obscured. It lasts until initiative count 20 on the next round. Each creature that starts its turn in the cloud must succeed on a DC 15 Constitution saving throw or be poisoned until the end of its turn. While poisoned in this way, a creature is incapacitated.
Regional Effects
The region containing a legendary undying dragon’s lair is warped by the undying dragon’s magic, which creates one or more of the following effects:
- Small earthquakes are common within 6 miles of the undying dragon’s lair.
- Water sources within 1 mile of the lair are supernaturally warm and tainted by poison.
- Rocky fissures within 1 mile of the undying dragon’s lair form portals to the Elemental Plane of Fire, allowing creatures of elemental fire into the world to dwell nearby.
If the undying dragon dies, these effects fade over the course of 1d10 days.
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