In this season of D&D Encounters,
Beyond the Crystal Cave, four keys are needed to enter the fortress of the main villain Soryth. The keys are a shamrock, an oak leaf, a rose leaf, and a sprig of mistletoe, and this is the first one.
The color of the ultra cheap acrylic paint used is actually called "Shamrock." The picture below shows the color better, but I can't get it to come out without a distracting flash reflection.