A Clump Of Stumps

Twilight wasn't aware that certain magics had a cumulative toxic effect. To be fair, neither were most ponies, but then again, most ponies never dealt with the thaumic throughput of the Element of Magic.

At first, she thought she had the feather-flu. She was newly pegasus-winged, and had no immunity. But it quickly became clear this was no ordinary case. The finest royal physicians were brought in, and her life was spared with minimal organ damage. Her legs, though, were a loss, trimmed back entirely.

At first, she was depressed. It wasn't until Rainbow Dash showed her a sci-fi story featuring cyborgs that she got her second wind.

One of the commonly held misconceptions about Twilight Sparkle was that she is a scientist of magic. Wrong. She's an engineer of magic. She kludges together disparate spells, she doesn't follow the scientific method, and she doesn't think beyond surface intuition except when she's doing an assignment.

So, when she saw the CMC sledding that winter, she figured out a sled-style platform with a body cushion and leg-stilts to match her previous lifestyle.

Her first attempt ended with a bruised nose and wounded ego. She stuck with flight-only for a while, but her wings tired easily. Her second attempt had wheels.  It sufficed for use in her crystal castle's long hallways, but now she's trying something new with minotaur tech...