Spectacular small container

Exploration Stage: Rapture Theater
From: Huntress
Description: Did you notice that none of the props in the play look like the typical old, cheap stage props? These are all real. I mean, you better pay close attention to what you find on stage. Bring me that glowing vase on the fireplace, please. Just be careful enough!
Completed: Oh my god! This vase is filled with mercury! This stuff is highly toxic. Anyway, don't touch the lid. There are a number of lethal items on this stage. What kind of finale could a play with all these props possibly have? I'm glad they're not actors stuck in a place like this.