The entrance to the Kobold lair is a long-dead magma dragon by the name of Ishum. A Kobold sits in the skull with a speaking horn that gives him a booming, scary voice. He warns travellers away unless they have a noble heart.
This is a systemless two page dungeon adventure that we created live on stream! This dungeon is designed with extreme usability in mind, to be slotted easily into whatever campaign you are running, spanning over one or two sessions.