How do detection spells work?

We left off in the midst of magic training. And now comes the kind of magic that Sweetie Belle has been trying to achieve throughout the story: a detection spell. But these kinds of spells might not be that easy, as Sweetie Belle is about to learn in the latest chapter.

TSweetie Belle Gains a Soul

• MLP: FiM
• Adventure
• Drama
• Slice of Life

In her darkest hour, Sweetie Belle finds salvation, but it comes with a terrible curse.

• Twilight
• Rarity
• Sweetie Belle
• CMCs

Bad Dragon · 132k words  ·  178  45 · 6.6k views

How do you think detection spells work? Let me know in the comments.