Dread Emperor

The Dread Emperor was one of the first major enemies Vox Machina fought prior to the Stream.

Background
The Emperor was a being that existed within it's own pocket dimension, which appeared as a giant Gothic Castle with a large bramble forest surrounding it. He found the company of children pleased him as he enjoyed their youth and spirit, and as such would go into the Material Plane to scout out for and bring back children to his realm in the guise of a child with black hair and golden eyes. When the children became to old, he would kill them and put their bodies in the castle basement.

Before the Stream
Vox Machina was tasked with investigating the disappearances of various children throughout Tal'Dorei. Hearing about the suspicious child which would appear a week before each child disappeared, they went off of that has their lead. Eventually, while celebrating their efforts for saving the city of Emon, they noticed the child talking to Sovereign Uriel Tal'Dorei III's son. They attempted to capture the child, who kidnapped the sovereign's son before they could do anything. However, they managed to find a way into the Dread Emperor's Realm.

During the final encounter, the Dread Emperor revealed his true form, and was using four children chained to him as human shields to block the attacks Vox Machina sent at him. In order to attack him, the party tried to free the children from him. They were able to save 3 of the 4 children; the last child was accidentally killed by Keyleth when she got into a tug-of-war with the Dread Emperor and the pressure on the child's collar broke is/her neck. Despite this, they were able to defeat the Dread Emperor.

Abilities
The Dread Emperor's abilities are an unknown, though it is clear he possessed a great amount of power.
 * Able to create his own small dimension
 * Polymorph