Ancalagon The Black

The intense heat and volcanic ash surrounds the dragon whose swept-back triple horns and jagged edged spinal frill  and massive wing span doubling its size define its silhouette. Its snout vents dark purple smoke and drips drying lava at all times, and its eyes glow with flame when it is infuriated and a gold tone when amused. Scales of dragon blackened with magma colored eyes with wings containing shades of obsidian and crimson color, It's chest and maw glows a volcanic orange prior to spiting fire. 

The Lair of Ancalagon The Black

Ancalagon dwells in massive cavern under a series of active volcano, within the deep halls of abandoned eldritch temple complex . Caves with volcanic or extreme geothermal activity are the most highly prized of Ancalagon's lair, creating hazards that hinder intruders and letting searing heat and volcanic gases wash over a the dragon in it's deep slumber.

With its hoard well protected deep within the lair, the dragon spends as much of its time within the mountain. For the great heights of the world are the throne from which it can look out to survey all it controls—and the wider world it seeks to control.

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 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:

• Magma erupts from a point on the ground the dragon can see within 120 feet of it, creating a 30-40 foot-high, 5-10 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 100-foot radius around the dragon. Each creature other than the dragon on the ground in that area must succeed on a DC 15 Dexterity saving throw or be knocked prone.
• Volcanic gases form a cloud in a 40-foot-radius sphere centered on a point the dragon can see within 200 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 13 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 the Great Dragon Ancalagon's lair is warped by the dragon’s magic, which creates one or more of the following effects:

• Severe earthquakes are common within 6 miles of the dragon’s lair.
• No Water Sources within 1 mile of the lair completely engulfed in molten lava and obsidian stone.
• Rocky fissures within 1 mile of the dragon’s lair form portals to the Elemental Plane of Fire, allowing creatures of elemental fire into the world to dwell nearby.
• Constant volcanic eruptions producing sulfuric fog and pyroclastic flow surrounding 1 mile of the dragon's lair.

If the dragon dies, a earth shattering earthquake will collapse the lair and the areas surrounding it within 1.5 miles into the portal of hell from were it originated 1d10 days.