The region surrounding a legendary emerald dragon’s lair is altered by the dragon’s magic, creating one or more of the following effects:
Crystal Profusion. Natural stone within 6 miles of the lair grows plentiful crystal formations and veins of emerald gemstones.
Fiery Sight. Fire and lava within 6 miles of the lair become conduits for the dragon’s psionic presence. As an action, the dragon can cast the clairvoyance spell, requiring no spell components and targeting any area of fire or lava in that region.
Subtle Obstruction. Rocks within 6 miles of the dragon’s lair sometimes move of their own accord, usually when no one is watching. Often the rocks obstruct the approach to the emerald dragon’s lair, with boulders moving to block narrow defiles, way-markers tumbling off the path, or smaller stones shifting beneath travelers’ feet to send them tumbling down slopes or into rivers.
Thriving Wildlife. Giant lizards are attracted to the area within 6 miles of the lair and settle there in large numbers.
If the dragon dies, the population of giant lizards near the lair returns to normal levels over the course of 1d10 days. Rocks immediately stop moving of their own accord. The existing abundance of crystals and emeralds remains, but new ones form at a normal rate.