Description and in-character behaviour

Nightmare Moon is corrupted version of princess Luna, the younger sister of princess/queen Celestia. As Luna she was the protector of the night. Her list of duties is very short but at the same time her tasks are very dangerous and wearisome. After using her power to rise the moon, she enters the dream realm to protect her subjects from nightmares. She was doing her job hundreds if not thousands of years. As a lunar creature she was always alone without anyone to talk with, flying in the endless abyss of dreams. In addiction to that the entire country idolize her sister not her, in fact, nobody even remembers about her or how important is her job. In fury and sadness Luna turned into Nightmare Moon to overthrow Celestia and cover the world in eternal night. During her rebelion she was defeated by her sister and imprisoned on the moon for almost thousand years. Now she's back to end what she has begun ages ago.

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In-character behaviour:

Experience and age

Well she is definitely experienced in magic duels. She doesn't have any problems with fighting as an equal with Celestia who is stated to be leagues superior to Twilight Sparkle. Twilight has experience of fighting with multiple enemies at once, fast and strong beasts, powerfull magicians and even experience of fighting with godlike creatures (Like planetary level reality warper or Tirek who's magic was at least nuke level. Luna has experience of fighting against the same reality warper or King Sombra - powerfull sorcerer who's wielding the dark magic. I think that she's supposed to be at least few thousands years old. While she daily fights against beasts, magical constructs and other enemies in dream realm.

Strength

Reflexes

She has shown the ability to dodge laser beams in middle air while simultaneously casting other spells. After making some math whe can assume that those laser beams travel with speed of >360 m/s. And she was able to react to them at distance of 30 feets while simultaneously casting other spells. She reacted to them often after they were shot so it makes her an bullet-timing character at least.

Speed

Nightmare Moon is insanely fast. She was able to tag Celestia twice, a person who's casual laser timer (speed of those blasts posted in reflexes section).

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Travels from moon to Equestria in one panel

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Rainbow Dash is a lightning-bolt timer who can fly even 3,800 mph and can casually break the speed of the sound in second.

Durability

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Tanks laser beam which can destroy entire stone walls/bridges

Magical abilities

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Laser beams:

• Effect: Sorcerer can create a magical missle which can travel at 320-360 m/s speed to destroy his opponent
• Casting time: less than second

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Her laser beams can create craters

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Weather manipulation:

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Magical barriers:

• Effect: Sorcerer can create magical barriers to protect himself from spells and physical attacks
• Casting time: less than second
• Duration: Untill sorcerer who casted it doesn't delete the effect

Feats:

Durability of shields is high. They can block with ease magical beams that are able to destroy entire stone bridges or walls with one shot.

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Shapeshifting:

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Illusions:

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Telekinesis:

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Moves out of the way Starlight Glimmer

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Feats of others, canonically weaker characters:

- Twilight fully repairs a broken dam so well no cracks can be seen.

- Twilight telekinetically lifts and transports a building sized bear and a water tower.

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Transfiguration:

Weaker characters feats:

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Dream realm magic:

Luna can enter to any dream of any person in the world anytime.

- Luna has a spell which can instantly put to sleep anybody. Here she uses it on Discord who's a planetary level+ reality warper.

- Also, Luna can combine dreams of entire town into one.

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Telepathy:

Luna can talk to anybody in the world via telepathy. The person will see her face on the moon (only the person the rest doesn't see anything) and will hear her voice.

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Teleportation:

More examples of teleportation of other characters:

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Moon manipulation:

Luna can raise and lower the moon whenever she wants. The writers of the show said that the moon has the same size as the our, real moon.

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Levitation/flying:

Nightmare moon can fly without using her wings

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Mane manipulation:

She has absolute controll over her hair