Pusty Swamp Ruins

Ancient lizardfolk ruins (The origins of Shamanism stem from Northern Europe and parts of Northern Asia)
Druid built settlement; places; herb garden, hollow trees, converted animal lairs, mirrorlike water for scrying, megalithic circles effects (similar to black dragon regional fog, undergrowth, animated trees
Current lair of Milath, adult black , defended by tribe Hardscale. They build crude draconic effigies along the borders. Also kobolds (just a few for traps), oozes, basilisk, clay golem
Milath's (underwater?) cave contains the bones of his mother/father.
Regional effects
His presence spontaneously creates many shambling mounds
6 miles;
Thick and twisted plants in reeking mud, traversing counts as difficult ground
Fog lightly obscures the land
1 mile;
Water sources are supernaturally fouled, causing regurgitation for enemies of the dragon.