Orb of the ancients?

[Valid or]

Out grinding for orbs, and I got two of these..are they for the next raid boss? But why would they drop during this one? We still need the other orbs.

[AvatarTBS]

I believe it's a random loot drop. I get those from time to time as well, and they always confuse me for a bit. One of the main storyline quests had us hit certain creatures until they dropped an "Orb of the Ancients".