Darkness

History
The power of Darkness is one of the seven ancient powers that created existence and belonged to the sorcerer Nocturna. this power has been passed down throughout the ages to many villainous beings, but has also been used by good beings as well. the current user, Luna, used this power to rise and set the moon and protect beings from nightmares. the users before her usually became dark shadows of themselves and turned evil, which is what happened to her. Twilight also had this power, but didn't use the true aspects of it. Tirek also used this power, but didn't have the required knowledge to use it properly. Dante was the newest user of this power, but soon returned the power to Luna and taught her how to master its abilities and drawbacks.

Purpose
the role Darkness has in the universe is to bring night and rest to existence. it also gives the user the ability to control dreams and travel through the dream realm. one downside this power is that the user, if they don't have good mental fortitude, will become a dark shadow of themselves.

Users
Luna: the current user, who uses this power to raise and lower the moon. she does possess immense power, but can only access the full extent of it when she becomes Nightmare Moon, who possesses the true power of Darkness after she's separated from Luna. after she reunites with Nightmare, she gains both access to the true power of Darkness and the ability to turn into Nightmare Moon and back into Luna.

Every previous user: all the users after Nocturna and before Luna used this power to spread darkness and evil throughout the universes they inhabited, due to the fact that the dark influence of this power overtook their minds.

Twilight: after she was given the power of the other princesses, Twilight gained some of Darkness' abilities. the only abilities she seemed to manifest were enhanced magic and the ability to move the moon.

Tirek: after he took the alicorn magic out of Twilight, he gained the power of Darkness. he didn't show any special powers besides extreme growth in size and magic.