 About half of Skirmisher's products have been published under the d20 System, a system of game mechanics for role-playing games published in 2000 by Wizards of the Coast, that is based on the third edition of "Dungeons & Dragons" and named after the 20-sided die which is central to the core mechanics of the system.Skirmisher products created for the d20 system include the books "Experts" (2002), "Warriors" (2003), "Tests of Skill" (2004), "Nuisances" (2005) and "Experts v.3.5" (2005).Artists whose work appears in these books include Brendan Cass, Dragan Ciric, Sharon L. Daugherty, William Hazzard II, Phil "Shade" Kightlinger and Lissanne Lake, noted for her numerous "Dragon"magazine covers, and Geoffrey Weber.