A Dragon Dungeon?

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The next piece of land that floated across the skies and landed in the far southeast of the Volcanic Lands was a gigantic forest filled with withered, black colored trees, giving fruit to gray leaves and red fruits. They seemed devoid of life, but once planted, the forest instantly started overflowing with a red-colored mist.

The red mist wasn't it all either, as it spread around, living beings started emerging from within the mist, of all kinds of shapes, but they looked… strange as well. Their bodies had exposed flesh, and some looked like they were decaying. 

Were these Undead Monsters?!

Ding!

[The Dungeon Facility [Withering Tree Forest (C++ Grade)] has been placed successfully, seven different species of Undead-type and Dark-type Monsters have emerged from Crimson Mist, beginning to slowly populate the area. Their population will slowly grow as they hunt one another and expand across the rest of the Volcanic-type Dungeon Floor.]