The helm of Eredin, the King of the Wild Hunt, is a significant part of his terrifying image. It's a skull-shaped helmet made of black steel, designed to inspire fear and reinforce the legend of the Winter Queen and her Wild Hunt. Eredin and his elves wore skeletal armor and skull-shaped helmets to appear as specters, leveraging human legends and superstitions. This fear-mongering tactic was part of Eredin's strategy to secure a sufficient number of slaves, preferably humans, for the Aen Elle in their world.