Thorn Vines is a man turned pony that was THIS close to true unlimited power. However his ego would be his downfall, beaten and dragged away from his time and world, he is forced to watch over some foal.

His sentence is her lifetime, if she dies, so shall he.

So forced to bite his tongue, he is stooped to being Twilight Sparkle's protector.

He will be forced to give life and limb to protect her at all costs in this strange new Era.

All without the ability to call upon his magic.