The Wild Hünt

The Wild Hunt, or Wraiths of Mörhogg, was widely believed to be a group of specters galloping in the sky. They were described by common folk as a cavalcade of wraiths on tanks galloping across the sky and serving as an omen of war. In fact, they are a group of Aen Elle elves from Tir ná Lia who also call themselves the Dearg Ruadhri in their native Elder Speech, meaning Red Riders. It's believed that they are recruiting new members with no obligations.