Kyogai

The Drum Demon, a demoted Lower Rank who reshapes his mansion with every beat.

Kyogai, known as the Drum Demon, is a former Lower Rank Six of the Twelve Kizuki. Muzan stripped him of his rank once he began losing the ability to eat humans and had reached his limit.

Quick Facts

Rank: Former Lower Rank Six
Lair: Tsuzumi Mansion

Facts from the source article.

Background

Desperate to win his place back, he attacks and eats people who pass by the Tsuzumi Mansion. Tsuzumi drums are set into his body, and striking them rotates the house's rooms, moves him through it and sends out powerful slashes of air. Tanjiro kills him after a long and difficult fight.