Black Earth

Black Earth is the final world in Dark Storm. It appeared in DS2 as Black Earth X, and is confirmed to appear in DS3 as Black Earth lll.

Dark Storm
Stephen arrives on this world after sealing every mandatory core, including Hollow Pokemone's core. He arrives on the surface of Black Earth, and heads to the center. He is transported to the Terminus. Here he can fight bosses from the other worlds again by going through each portal. After heading through the biggest portal, Stephen fights the Pulveriser, a dragon-like Darkness. When the Pulveriser's defeated, the arena collapses, and Stephen falls into The Final Rest Area. Here he can buy items, save, and go to the final boss. After some healing, Stephen heads through the large door, leading him to Stimulated Warwick. Chad Endy appears, and talks to Stephen in a conversation. Stephen says that the light inside him is stronger than any Darkness. Chad Endy calls on the Shadow Guard to fight. When Stephen defeats the Shadow Guard, Chad uses all his power to fight Stephen himself. After being bested, Chad Endy merges with a colassal Darkness called The End of the Line! After that battle is won, Chad Endy dies, and the Darkness disappear. Then Stephen and his Party members (save for Meta Knight) are frozen by Fawful. The game ends.

Dark Storm 2
Black Earth X is the second-to-last world. it just has Stephen explore it and leave.