Derii (デリー, Derii) is a demon in the series.
A combination of "Devil" デブル and "Fairy" フェアリー.
Devil Children Fire/IceEdit
Derii can be found in the Lotus Marsh in Ice Book and Acheron River in Fire Book. He has the power Dim 1, which levels up over time as it fights in battle.
Devil Children Fire/Ice BookEdit