For those of you who are too lazy to click and read about the lore theory, because it's too good not to share:

• It's long been thought that there is an Old God beneath Tirisfal Glades, as referenced in the in-game book The Founding of Quel'Thalasand other sources:

Forging inland, the high elves founded a settlement within the tranquil Tirisfal Glades. After a few years, many of them began to go mad. It was theorized that something evil slept beneath that particular part of the world, but the rumors were never proven to be true.

• The zone where this event is located is called the Whispering Forest. Old Gods are known for whispering into your mind as we have seen from C'thun and Yogg-Saron.

• The item Puzzle Box of Yogg-Saron makes several references to a forest, and to a "black goat" there:

Look around. They will all betray you. Flee screaming into the black forest.

There is a little lamb lost in dark woods.

Have you had the dream again? A black goat with seven eyes that watches from the outside.

This is such good stuff! I love me some lore.