Calculating and cunning, grey dragons are manipulative, never taking action unless they see benefit in doing so. Grey dragons are lazy, rarely venturing from the mountain caves they inhabit except to hunt, and a grey dragon prefers to eat all of its kills.
A grey dragon has a thick, yet limber body and very long wings that it usually keeps tucked close to its body. A ridge of jagged horns emerges from the back of its head, culminating in an imposing crest, while several small spikes jut out around its eyes. A young grey dragon has stony grey scales with a few flecks of lighter and darker grey. As it ages, these flecks become larger and more varied, giving an adult grey dragon a mottled appearance with some scales nearly black, and others almost white.

Cold and Distant. Grey dragons are arrogant and aloof, cold as the bitter gales of the mountains they inhabit. They hate and avoid all other kinds of dragon, viewing them as inferior, and they see humanoids as little more than slaves to be devoured as they see fit. They find orcs and half-orcs to be the tastiest of humanoids, so an orc horde that draws too near to the lair of a grey dragon rarely escapes without major losses, so nearby settlements are rarely attacked by orcs, though a grey dragon isn't picky about what it eats, and so might devour an attacking orc horde and the population of a village at the same time.
Conversely, they find elves and dwarves disgusting, often leaving settlements predominately inhabited by members of those races relatively unscathed unless they incur the dragon's ire.

Frigid Treasures. A grey dragon is an avid collector of stones, and their treasure hoards are often littered with oddly shaped or colored stones that the dragon has accumulated during its life. Other treasures they value include objects made from or including pieces of stone, particularly obsidian or granite.

A grey dragon prefers to build its lair in caves in the highest snow-capped mountains, far from thieves and other dragons.

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:

• The dragon conjures limbs of ice and stone that burst from a wall that it can see within 120 feet of it. The limbs sweep at a creature of the dragon's choice within 30 feet of the wall, which must succeed on a DC 15 Dexterity saving throw or take 10 (3d6) bludgeoning damage.
• A cloud of mist swirls about in a 20-foot-radius sphere centered on a point the dragon can see within 120 feet of it. The cloud spreads around corners. Each creature in the cloud must succeed on a DC 15 Constitution saving throw or be blinded 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.
• Ice and stone erupt from a point on the ground the dragon can see within 120 feet of it, creating a 20-foot-high, 5-foot-radius spike. Each creature in the spike's area must make a DC 15 Dexterity saving throw, taking 21 (6d6) piercing damage on a failed save, or half as much damage on a successful one.

Regional Effects

The region containing a legendary grey dragon's lair is warped by the dragon's magic, which creates one or more of the following effects:

• Snowstorms rage within 6 miles of the lair.
• Slippery ice (see "Wilderness Hazards" in chapter 5 of the Dungeon Master's Guide) spontaneously forms within 1 mile of the lair.
• Menacing faces can occasionally be seen in the clouds within 1 mile of the lair.

If the dragon dies, these effects fade over the course of 1d10 days.