It has long been debated whether the Cheese Dragon is a constructed entity, a dragon suffering from some sort of curse, or a monster created by some creative but insane wizard who wanted some food that fights back. Whatever the case, their existence has been noted, and the number of adventurers and other hungry travelers who have fallen prey to it (or its naturally meaty odor) increase by number with every encounter.
Cheese Dragons have a physical appearance akin to Red Dragons, but without wings. Instead, their front claws are larger and wider for burrowing into the ground. In addition to this minor difference is the fact their bodies, as the name such, is made of a hard cheese-like substance. The scales are a pale, yellow-white speckled with bits of dark blue and green. Adventurers who either have survived an encounter or defeated this oddity among dragons have claimed that once you have a good cleave through the hide, it begins to bleed hot yellow cheese sauce. They only thing that makes the creature even more iconic to its namesake is it's breath weapon; a long stream of bubbling hot cheese sauce, capable of burning flesh like fire and ensnaring any target unlucky enough to be drenched by it.
Unlike most other dragons, who hoard riches and valuables, Cheese Dragons tend to gather fine wines, exotic champagnes, rare brews and other strange concoctions. In some rare instances, Cheese Dragons have been known to keep several dozen cattle with a hefty supply of hay and water nearby. Whether it to fatten them up for a meal, or for other purposes, no one knows.

Oddity Among Dragons. It is hard to classify a cheese dragon as an actual dragon due to it's physical, biological traits, and the fact it is capable of reproduction destroys the chances that it's some kind of construct. However, it's behavior is still similar to dragons, as is the danger it possesses to others.

Cheesy Homogenesis. Cheese Dragons don't reproduce like most other creatures. In fact, the way they reproduce has baffled any scholar that has witness it. It was discovered that all cheese dragons, regardless of location, are all born female. They are also very unlikely to crossbreed with other dragons. Scholars theorize that, because of how their bodies are made, and especially what they are made of, cheese dragons lay eggs after consuming an exorbitant amount of necessary minerals and chemicals from what they eat. Those eggs then are kept warm either by the mother or by the hot cheese sauce the mother expels from her maw.

A Chef's Favorite Hunt. Chefs and other culinary masters have all proclaimed that the flesh and blood of a cheese dragon is an exquisite ingredient that is far superior to any existing cheese used in food. Because of this, Hunting parties are hired by chefs to acquire these ingredients and payment is easily fifty gold pieces for just a quart of a cheese dragon's 'cheese blood sauce'. Of course, cheese dragons are hardy opponents and will fight to survive.

Cheese dragons choose subterranean caverns near foothills or river-side canyons that reside within a short range of thick-forested mountains. The tunnels of these caverns are expertly carved away by the cheese dragons massive fore claws to turn it into something similar to a labyrinth. The longer a cheese dragon resides in it's lair's location, the thicker a strange green-blue mold grows along the lair's walls. The way the lair is crafted gives the cheese dragon the ability to slightly increase the range of its own meaty scent or the range which it can detect intruders.

Lair Actions

On initiative count 20 (losing initiative ties), the cheese dragon takes a lair action to cause one of the following effects; the cheese dragon can’t use the same effect two rounds in a row:

• Mold spores explode in a 20-foot radius circle centered on a point the dragon can see within 120 feet of it. The spore cloud spreads around corners and the area it occupies is heavily obscured. Each creature in the spore cloud when it appears must succeed a DC 15 Constitution saving throw or become infected with a disease. Creatures immune to the poisoned condition, and the cheese dragon itself, are immune from this disease.
  Spores invade the creature's system, killing the creature in 1d8+the creatures Constitution score hours. In half that time, The creature becomes exhausted, but cannot recover with food or rest. The creature starts at Exhaustion level 1 and gains an exhaustion level for every hour, or every 2+Constitution modifier hours if the creature has a Constitution score of 12 or more. If the disease isn't removed before the creature dies, the creatures body's produces 1d3 tiny mold pods. These pods have AC 10, 3 hit points, vulnerability to fire, cold, and acid damage, and immunity to poison and psychic damage.The mold pods will grow one size category every 4 days, gaining double the hit points from the previous size category, until they are destroyed. If the mold pod is damaged but not destroyed, it releases a spore cloud in a 5-foot-radius circle centered upon itself, with increased 5-foot-radius area for every size category it has grown.The spore cloud's effect is the same.
• A tremor shakes the lair in a 60-foot-radius around the cheese dragon. Each creature must succeed a DC 15 Dexterity saving throw, or be restrained until a successful DC 10 Strength check is made during the creature's turn.
• A 20-foot-radius patch of mold on the lair's floor centered on a point the cheese dragon can see within 120 feet engulfs up to two Medium or smaller creatures unless they succeed on a DC 15 Dexterity saving throw.  On a failed save, the engulfed target is blinded, restrained, and unable to breath, and must make a DC 12 Constitution saving throw or take  11 (2d8+2) bludgeoning damage. The mold has AC 10, 4 hit points, and vulnerability to slashing and fire damage. Any damage dealt to the mold with any engulfed creatures affected by it is also dealt to the creatures, but frees them.

Regional Effects

The region containing a legendary cheese dragon’s lair is strangely mutated by the dragon's innate magic, which creates one or more of the following effects:.

• All vegetation within 6 miles produces a strong funky odor, attracting various buzzing insects. All Wisdom (Perception) checks to listen have disadvantage.
• Several stony areas within 1 mile of the cheese dragon's lair have a blue-green mold growing on it. This mold serves as the cheese dragon's eyes and ears.
• Any other subterranean caverns with 3 miles of the cheese dragon's lair becomes a perfect location for a myconid colony, and any myconids who dwell there will care for a cheese dragon's eggs and young while it is away, preventing any harm to them by any means.

If the cheese dragon dies, the myconid colony will remain as it was, but all other effects fade over 1d10 days.