It is mentioned briefly in the manga and is featured in the video games Yu-Gi-Oh! Dark Duel Stories, Yu-Gi-Oh! The Sacred Cards, Yu-Gi-Oh! Reshef of Destruction, and Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist.
Monsters of this Alignment tend to be surreal, from another dimension ("D.D. Warrior"), illusory ("Talons of Shurilane"), tricksters ("Genin"), or manipulators of illusions ("Illusionist Faceless Mage"), sleep ("Invitation to a Dark Sleep"), etc.