Duke Tseldora was the proprietor of Brightstone Cove and founder of the mining town which once flourished there. He disappeared after the town was suddenly and mysteriously overrun by spiders, and he was never heard from again. Though the circumstances surrounding the Cove's destruction remain unclear, the murky truth behind the Duke's disappearance seems somehow related to his unnatural obsession with spiders.
He drops the Brightstone Key when killed, which bears the description, "The eccentric Lord Tseldora, known for his fascination with spiders, built a town and a personal fortune by mining brightstone. One day, the town was overrun by spiders, but Lord Tseldora only stood by and watched, eerily contented."