A scent of sour rot akin to rotting citrus can be smelt from and around this creature. Clicking of bones and popping of air pockets can be heard as the creature moves. Twelve feet tall pale and sickly white with a greenish tint humanoid shaped creature with extended arms and legs. The feet are not however like a human, being avian in appearance with 3 digits that end in black disgusting talons with a single talon protruding from the rear of the foot. The skin is tight on it's gaunt body and veins of black, blue and deep crimson can be seen up close. Random cuts and rotted away flesh exposes a deep red flesh under with black ichorous infected looking meat. The creature if felt is smooth and slightly damp to the touch, as cold as death itself to the touch.

This may or may not be balanced for the challenge rating as it is my first attempt at a totally original homebrew monster.

If the Abhorrent Mist Walker is encountered in a lair then treat the creature as a CR 16 creature.

The Abhorrent Mist Stalker gets it's name from the red heavy and thick mist that begins to form around its dwellings. This dwelling can be almost any terrain to begin with but as this mist settles it slowly kills off all plant life excluding trees by blocking sunlight. Eventually the area will also have bodies of local wildlife and dead plant matter scattered around, small pools of what looks like blood will also begin to form as enough of this red mist settles and regresses back to liquid state. The area will smell like fermenting citrus fruits and rotting flesh. Nothing but undead can survive in the area with only dying trees, minerals, and the soil itself being visible.

Lair Actions

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

• Magical opaque red mist spreads from a point the stalker chooses within 60 feet of it, filling a 15-foot-radius sphere until the stalker dismisses it as an action, uses this lair action again, or dies. The mist spreads around corners. A creature with darkvision can’t see through this mist, 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, lost in the darkness of the thick mists.

• A cloud of red poisonous mist fills a 20-foot-radius sphere centered on a point the stalker creates within 120 feet of it. The cloud spreads around corners and remains until the stalker dismisses it as an action, uses this lair action again, or dies. The cloud is heavily obscured. Any creature in the cloud when it appears must make on a DC 15 Constitution saving throw, taking 10 (3d6) poison damage on a failed save, or half as much damage on a successful one. A creature that ends its turn in the cloud takes (3d6) poison damage.

• Pools of mist water that the stalker 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 creature ending it's in the pool for this round must succeed on a DC 15 Con saving throw or be infected with Fettle Decay

Regional Effects

The region containing a legendary [monster name]’s lair is [enter the effect description], 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 in their dead state, and the ground becomes pooled with thick sticky liquid pools, the ground around it becomes muddy and the air reeks of fermenting citrus and rotting flesh.
• Water sources within 1 mile of the lair are supernaturally fouled. Enemies of the dragon that drink such water regurgitate it within minutes and have a 40% chance to be diseased with fettle decay (1-8 on a d20).
• Red thick fog lightly obscures the land within 5 miles of the lair.

If the Stalker dies, these effects fade over the course of 3d4 days.