Unite Mode: Equus

Unite Mode: Equus (モード：エクウス) is a Shadow Magic spell.

Description
With an open grimoire, the user assimilates Slotos into their body through Shadow Magic. The spell enables the user to contain and control the power of the devil, dramatically increasing their own magic power and capabilities.

During the transformation, the user is covered in armor made of shadow, which gives the user the appearance of a castle tower. An enclosed helm covers the user's head with their horns poking out of the temples. A pair of armored boots cover the user's feet and extend up past their knees. Also, a pair of large shields hover over and move with the user's arms. The user's chest is wrapped in a sheet of shadow with a block-like pattern.

One of Slotos's abilities, Toughness (剛健) greatly enhances the user's physical resilience, enabling them to withstand and move in immense gravity.

Trivia

 * Equus is Latin for "horse".