Inker's Armband (Patreon)

Wondrous item, common

This brushed metal bracelet is lined with a magical black ink. The ink only stains skin and slides harmlessly off of clothing. While wearing the bracelet, you can use a bonus action to cause magical tattoos to appear on the arm that's wearing it. The tattoos remain until you remove the bracelet or use a bonus action to end the effect or change their appearance. These tattoos can either be still or magically animated in a slow loop that repeats every 6 seconds. Regardless of the tattoo, the armband only produces black ink.

The warlock reached out, pointing an angry finger toward his mark. Black, twisting tattoos of hellfire licked up his outstretched arm as a final blast of magic turned the monster to dust.