Defining:Dark-
devoid of or deficient in light or brightness; shadowed or black; "sitting in a dark corner"; "a dark day"; "dark shadows"; "dark as the inside of a black cat"
(used of color) having a dark hue; "dark green"; "dark glasses"; "dark colors like wine red or navy blue"
brunet (used of hair or skin or eyes); "dark eyes"
black: stemming from evil characteristics or forces; wicked or dishonorable; "black deeds"; "a black lie"; "his black heart has concocted yet another black deed"; "Darth Vader of the dark side"; "a dark purpose"; "dark undercurrents of ethnic hostility"; "the scheme of some sinister intelligence ...
secret; "keep it dark"
showing a brooding ill humor; "a dark scowl"; "the proverbially dour New England Puritan"; "a glum, hopeless shrug"; "he sat in moody silence"; "a morose and unsociable manner"; "a saturnine, almost misanthropic young genius"- Bruce Bliven; "a sour temper"; "a sullen crowd"
absence of light or illumination
benighted: lacking enlightenment or knowledge or culture; "this benighted country"; "benighted ages of barbarism and superstition"; "the dark ages"; "a dark age in the history of education"
iniquity: absence of moral or spiritual values; "the powers of darkness"
marked by difficulty of style or expression; "much that was dark is now quite clear to me"; "those who do not appreciate Kafka's work say his style is obscure"
darkness: an unilluminated area; "he moved off into the darkness"
blue: causing dejection; "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"; "a disconsolate winter landscape"; "the first dismal dispiriting days of November"; "a dark gloomy day"; "grim rainy weather"
night: the time after sunset and before sunrise while it is dark outside
colored: having skin rich in melanin pigments; "National Association for the Advancement of Colored People"; "dark-skinned peoples"
an unenlightened state; "he was in the dark concerning their intentions"; "his lectures dispelled the darkness"

Defining:Avengence-
someone who takes vengeance
The Tank, Cruiser, Challenger (A30) was a British tank of World War 2. It mounted the 17 Pounder gun on the Cromwell chassis, in order to add heavier anti-tank firepower to the cruiser tank units.
Avenger is a Space Invaders clone published by Commodore International for the VIC-20. A year later it was released for the Commodore 64.
The General Atomics Avenger (was Predator C) is a developmental unmanned combat air vehicle (UCAV) built by General Atomics Aeronautical Systems for the United States military.