The mysterious magical weapon that lay asleep in the Korou Fortress. The four forms correspond to the Four Symbols.
It is included in the model kit of Ryofu.
Souryuu form is for Ryuubi, Enhou for Sousou and Douko for Sonken and Shinbu is for Ryofu use.
In the main comic adaptation, the Tengyokugai first appears when Sonken summons it in grief over his father's death and goes on a devastating rampage across the battlefield. Ryuubi later summons its Souryuu form to defeat Toutaku. In the second storyline, Sousou is able to summon the Enhou formation twice and on the second occasion uses it to fight Ryuubi. When the two team up to save the planet the Tengyokugai reforms into a stripped down version of the Souryuu for Ryuubi uses, with the left over pieces (the bird head cowl, wings and twin guns) combining with Sousou in an alternate version of the Enhou configuration.