Black dragons dwell in swamps on the frayed edges of civilization. A black dragon’s lair is a dismal cave, grotto, or ruin that is at least partially flooded, providing pools where the dragon rests, and where its victims can ferment. The lair is littered with the acid-pitted bones of previous victims and the fly-ridden carcasses of fresh kills, watched over by crumbling statues. Centipedes, scorpions, and snakes infest the lair, which is filled with the stench of death and decay.
Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row:
Pools of water that the dragon can see within 120 feet of it surge outward in a grasping tide. Any creature on the ground within 20 feet of such a pool must succeed on a DC 15 Strength saving throw or be pulled up to 20 feet into the water and knocked prone.
A cloud of swarming insects fills a 20-foot-radius sphere centered on a point the dragon chooses within 120 feet of it. The cloud spreads around corners and remains until the dragon dismisses it as an action, uses this lair action again, or dies. The cloud is lightly obscured. Any creature in the cloud when it appears must make on a DC 15 Constitution saving throw, taking 10 (3d6) piercing damage on a failed save, or half as much damage on a successful one. A creature that ends its turn in the cloud takes 10 (3d6) piercing damage.
Magical darkness spreads from a point the dragon chooses within 60 feet of it, filling a 15-foot-radius sphere until the dragon dismisses it as an action, uses this lair action again, or dies. The darkness spreads around corners. A creature with darkvision can’t see through this darkness, and nonmagical light can’t illuminate it. If any of the effect’s area overlaps with an area of light created by a spell of 2nd level or lower, the spell that created the light is dispelled.
Regional Effects
The region containing a legendary black dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects:
The land within 6 miles of the lair takes twice as long as normal to traverse, since the plants grow thick and twisted, and the swamps are thick with reeking mud.
Water sources within 1 mile of the lair are supernaturally fouled. Enemies of the dragon that drink such water regurgitate it within minutes.
Fog lightly obscures the land within 6 miles of the lair.
If the dragon dies, vegetation remains as it has grown, but other effects fade over 1d10 days.
Observations
The most evil-tempered and vile of the chromatic dragons, black dragons collect the wreckage and treasures of fallen peoples. These dragons loathe seeing the weak prosper and revel in the collapse of humanoid kingdoms. They make their homes in fetid swamps and crumbling ruins where kingdoms once stood.
With deep-socketed eyes and broad nasal openings, a black dragon’s face resembles a skull. Its curving, segmented horns are bone-colored near the base and darken to dead black at the tips. As a black dragon ages, the flesh around its horns and cheekbones deteriorates as though eaten by acid, leaving thin layers of hide that enhance its skeletal appearance. A black dragon’s head is marked by spikes and horns. Its tongue is flat with a forked tip, drooling slime whose acidic scent adds to the dragon’s reek of rotting vegetation and foul water.
Brutal and Cruel. All chromatic dragons are evil, but black dragons stand apart for their sadistic nature. A black dragon lives to watch its prey beg for mercy, and will often offer the illusion of respite or escape before finishing off its enemies.
A black dragon strikes at its weakest enemies first, ensuring a quick and brutal victory, which bolsters its ego as it terrifies its remaining foes. On the verge of defeat, a black dragon does anything it can to save itself, but it accepts death before allowing any other creature to claim mastery over it.
Foes and Servants. Black dragons hate and fear other dragons. They spy on draconic rivals from afar, looking for opportunities to slay weaker dragons and avoid stronger ones. If a stronger dragon threatens it, a black dragon abandons its lair and seeks out new territory.
Evil lizardfolk venerate and serve black dragons, raiding humanoid settlements for treasure and food to give as tribute and building crude draconic effigies along the borders of their dragon master’s domain.
A black dragon’s malevolent influence might also cause the spontaneous creation of evil shambling mounds that seek out and slay good creatures approaching the dragon’s lair.
Kobolds infest the lairs of many black dragons like vermin. They become as cruel as their dark masters, often torturing and weakening captives with centipede bites and scorpion stings before delivering them to sate the dragon’s hunger.
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