It's uh... Like a ritual. You need something to help you focus your magic, get it? So you pick something—everyone says it needs to be significant to you, but that's bullshit. My last one was a tattoo.

[She shows him her left arm, where her tattoo was. There's nothing but a big scar now.]

The one I'm using now is just a cheap necklace. Anyway, it's like you're... Like you're tethering whatever it is to yourself. Attuning it to your magic, right? If you don't have your focus while you're casting more powerful spells it's harder to control them and they're way less predictable.