The One Behind it All

In a lab many years ago, there was a mutation gone wrong who destroyed the lab it was in. In the same ward was a genetically created unicorn who had the power to control minds.

she escaped as well, and traveled the outskirts of the Everfree Forest, messing with the minds of any pony she met.

Not long after her escape, she met a pony who was in love with another. She hated the emotion, so she possessed the pony and made her commit a crime - killing her love, whose filly she was apparently pregnant with. The mare was taken to prison. The unicorn followed her there, hoping to mess with her mind some more, but the pony aw her. She pleaded tot help her out, ad the unicorn mare conceded, on one condition: she would get the baby. The mare accepted.

Later that year, she took away the newborn filly and cursed her to a never-ending life of misery ad loneliness.

At the hospital where the filly was born she saw a little newborn colt. She messed with his mind and sight, causing him to go mute, his sight to become infrared, and doctors to believe he had no vocal chords.

A few years later, she was in the Prince Blueblood Island area, and she saw the orphanage there. She glimpsed a lonely orange foal. The unicorn knew nopony would miss the little worthless thing, so a few days later, she met a group of stallions and possessed them. She gave them her mental memory of the filly and coated it with hate and a need to see her blood, which the stallions then felt.

She waited for a few days, but she heard of no new deaths, so she assumed the filly hadn't been important enough and moved on.

A few weeks later, she saw a foal who was just older than the little orphan. She was obviously loved, but she simply messed with her mind.

The next year, she left the Everfree and entered Canterlot. She wanted to mess with more ponies' minds, so she did. She found three different foals and messed with their minds in similar ways.

In three years, she saw a sad filly fly past her and gave her a harsh curse that would ruin the rest of her life.

The next year, she saw a very depressed filly crying her eyes out and decided to scare the foal. Casting a permanent mind spell, she left soon after.

A couple of years later, not long after the Crystal Empire had returned, she found a colt lost in the woods and decided to play a little mind game with him.

She hasn't done much since then.

She has given herself a name that one could say would be fitting.

The name she deemed upon herself... is Mind Hex.