Cook left Wizards of the Coast in 2001. Cook's "Beyond the Veil" (2001) was one of the later books in Atlas Games' "Penumbra" line of d20 System books. Cook started a new company Malhavoc Press in 2001 as an imprint of White Wolf's Sword & Sorcery Studios, with the d20 "The Book of Eldritch Might" (2001) as his first product. "The Book of Eldritch Might" was the first commercial book published exclusively as a PDF that was released by a print publisher. It was an immediate success and has been credited with demonstrating the viability of PDF publishing within the role-playing industry. This and other early Malhavoc products were initially released only in electronic format, though print versions of most of them have since been released by White Wolf, Inc. Malhavoc Press worked with Fiery Dragon Productions after the latter left Sword & Sorcery in 2002, and the majority of Fiery Dragon's licenses were taken from Malhavoc. Cook's work under the Malhavoc banner has included "Arcana Unearthed: A Variant Players Handbook". "Arcana Unearthed" is set in Cook's world of "The Diamond Throne", a giant-dominated setting.