Infernal Snowflake

As an old-school Dungeons and Dragons player I have no idea why there are so many Tieflings right now. Did a Dark Portal open in Toril and is just pumping demons non-stop? What is happening?

But I am old-school, I just kill the demons (or demon-adjacent) and let Kelemvor sort them. If I am going to second guess my murder spree I may as well not kill orcs and goblins either.