Dream of the Book of Darkness (闇の書の夢 Yami no Sho no Yume) is a hallucinatory spell (幻覚魔法 genkaku mahō) cast on those captured into the "capture space" by Absorption to further reduce the likelihood of their escape. For simplicity, it is classified as an illusion magic normally seen under the Midchildan system. It can access the mind of the captured opponent, and create illusion deep in their mind.