Go read it and The Enchanted Library. They are top tier.
(This is from Chapter 20 of TEK!)
Copic markers on Strathmore 400 recycled drawing paper. The inking is a mix of Deleter #4 and some Pigma Graphic pens. Incantation’s eyes and the Hearts also have Spica Glutter pen in them, but a photo doesn’t do them justice, as they don’t twinkle in a still.