The Warhammer 40,000 Codex: Aeldari is an Army Book for the Eldar army in the Warhammer 40,000 game. Written in English and originating from the United Kingdom, this book contains rules, lore, and tactics specific to the Eldar faction. It serves as a valuable resource for players looking to enhance their gaming experience and better understand the strengths and weaknesses of the Eldar army in the Warhammer 40,000 universe.