The Well's Unknown Abyss

Bottomless Well (不知井底) is a Shikigami technique used by Megumi Fushiguro that combines his bird and toad familiars.

Description
By creating the shadows of both Nue and the Toad, Megumi can combine them together to create winged toads to aid him in battle. These toads can fly with increase mobility, as well as use their tongues to restrain opponents.

Megumi first used this technique to fight against Aoi Todo.