India ink on tissue paper. I had never used ink on this kind of paper before; I really liked the results! There are some folds and wrinkles on the paper that give the pattern some interesting details. The paper is also super absorbing, which plays nicely with the quantities of ink. Since it's very thin, there can easily be overlays between textures. And finally, when trying to use less ink (so that it wouldn't seep through and cause a big dot - the absorbing quality is nice, but it was also somewhat of a challenge!) I used very little ink on the lettering, causing a scratchy, dry look.
"Dementors are among the foulest creatures that walk this earth. They infect the darkest, filthiest places, they glory in decay and despair, they drain peace, hope, and happiness out of the air around them." - J.K. Rowling
