Cubic

"Houkai" (方界, Houkai) is a series used by Aigami in the Yu-Gi-Oh! The Dark Side of Dimensions film. They are based on the Dikpāla.

Based on revealed information, "Houkai" are powerful monsters with 0 ATK and DEF that can’t lose in battle. "Houkai Spawn Vijam" acts as the key card for the entire Deck and apparently can increase the Levels of the other "Houkai" monsters, who gain effects as they gain Levels.