It's a fantasy role-playing game.

DM: You are Jester Lavorre, a tiefling cleric . You are the member of the famous group of adventurers. Previously, you, Beau, and Molly go to The Fungal Fount. On the way, Beau brings up the issue of what to do with Kiri-- she's afraid Kiri will die if they keep her with them.
DM: "Right, okay. So I've been working on something for you based on what you requested and I have these." He puts these two vials on the table. One of them is a healing potion, larger than the basic kind. The other is a sky blue color, and as he sets it on the table, as soon as it impacts, there's a flash and you see some sparkles kind of going (energy crackling) through it before it settles. And he goes, "I'm going to be honest, not entirely certain the extent of what this is. It protects you from something. I know the basis of it is insulation."
Player: What's the gold stuff in there?
DM: "I do not see what you mean."
Player: What's the stuff that swirled around when you put it on the table?
DM: He taps it again and (energy crackling). It looks like a spark.
Player: What is that?
DM: "I don't know. But I bet it's interesting."
