The Lost World Part 4: The Mage Guild is a mod for registered Wolfenstein, made by Kyo Kusanagi. It was released on October 9, 2006.
Some maps were made by Mac Mendoza, though he was not credited on the title screen or in the release announcement.
It featured 40 levels, some of which were taken from Chemical Warfare, Totengraeber and Operation: Panzerschiff, in addition to the odd original Wolfenstein level, making for a confusing level layout.
Graphics are in high resolution and the gameplay is otherwise quite atmospheric, being mainly a magic/medieval themed mod.