Name: Dark One
Difficulty: 20
Base level: 15
Base experience: 495
Speed: 12
Base AC: 0
Base MR: 80
Alignment: -10
Frequency: unique, no random generation
Genocidable: No
ATTACKS:
    Projectile as weapon, or if in range, uses melee weapon for 1d6
    Random magic spell with nominal damage of (level/3+1)d6
    Projectile as weapon, or if in range, uses melee weapon for 1d6
    Steals the amulet etc.
Weight: 1450
Nutritional value: 400 (but leaves no corpse)
Size: medium
Resistances: None
Resistances conveyed by eating: None

Dark One is humanoid. It is an omnivore.

... But he ruled rather by force and fear, if they might avail; and those who perceived his shadow spreading over the world called him the Dark Lord and named him the Enemy; and he gathered again under his government all the evil things of the days of Morgoth that remained on earth or beneath it, and the Orcs were at his command and multiplied like flies. Thus the Black Years began ...
The Silmarillion, by J.R.R. Tolkien