Dawnshine Wonder

In my MLP fan fiction I am thinking of a fan made spell called Curse of the 13 Tridents for Twilight Sparkle. It's a duplication spell, by materializing 13 tridents, she can summon multiple copies of herself at will, non sentient illusions that she controls. The 13 tridents then come together around her creating an impenetrable barrier that can only be nullified by something like Alicorn magic, Holy Water or chaos magic.