Horror Hall was a castle in the Fright Zone and was the ancestral home of Scorpia's royal family. When Hordak and the The Horde first came to Etheria, they arrived in the Fright Zone and made an alliance with Scorpia's grandfather, who was the king. As part of the alliance, Scorpia's family gave The Black Garnet to the Horde, and Horror Hall was abandoned.[1][2]
Scorpia would occasionally retreat to Horror Hall to reminisce and create stories about her ancestors. Fearing for Emily's safety, Scorpia brought her to Horror Hall to hide her from Catra.[2]