Re: The Whitetail Woods
"It's not quite as simple as that. There's different forms of disenchantment, after all. They have the same final result -- that the magic is dispersed -- but to different effects. Have a seat." Twilight gestured for Starcrasher to rest in the grass, which meant that she was about to launch into a lengthy lecture... again.
With a quick conjuring of a chalk board that floated in the air behind her, Twilight went on to explain the structure behind magical spells. There was innate magic in the world that occurred naturally, but when it came to Unicorn spells, they took their own energy (or borrowed it from other sources) and shaped it into a tangible effect on the world around them. As she lectured, Twilight illustrated on the board, representing a constructed spell as a snowflake-like lattice. Even the same spell cast by the same Pony was different each time it occurred, and the differences became even more prominent when cast by other Ponies, or using different sources of energy.
But in all that, there was a constant -- the structure always had a core point of focus in it. The spell would manifest as a point of energy and spread outward, taking shape and thus having an impact on the world. So long as the spell had sufficient energy to endure, it would do so. Disenchanting was the process of removing the spell's connection to the energy, be it severing the link to the Unicorn casting it or undoing its own stored energy.
"When it comes down to it, there's really only two ways a spell can be broken. That's not counting suppressing the spell either -- in that case, the magic is still there but it's just being temporarily stifled. Actual disenchantment completely removes a spell." Twilight explained. "There's Deactivation, which is the most common method, and Nullification, which is a far more rare practice. The difference being is that Deactivation is a precise, comparably surgical action while Nullification is brute force. They're both effective, but not everypony has the sheer stopping power necessary for Nullification. What you were doing to the battery earlier was Deactivation. Compare:"
With that, Twilight pointed her horn at the nearby battery. The tip of her horn flashed with a sudden bolt of purple light that struck the device like a crackle of lightning, knocking it to the grass and leaving it spinning on its edge. As it settled, not only was the meter at absolute zero, but the magical crystal contained inside the battery casing had turned a cold gray color. Twilight once more lit up as she did when she'd recharged the battery before, but this time it remained a dead cell -- its capacity for magic had been totally destroyed.
"A long time back, I made the mistake of casting a mind-compelling enchantment on a doll of mine that affected a lot of Ponies. I couldn't Deactivate the spell because I couldn't get a clear shot at the doll, but in the end the spell was Nullified by some... ah... divine intervention." the Unicorn rubbed the back of her neck sheepishly at the memory of that particular event. "Neither form is innately good or bad, nor superior to the other. It just depends on what your individual need is, and what your own abilities are capable of supplying. Being able to do both is ideal. Are you following me so far?"