World Portal

The in Dungeon Keeper Online transports from the underworld to the overworld.
A similar thing appears in the intro and outro of Dungeon Keeper 2. In the intro, a Wizard is seen sealing it and taking a Portal Gem to protect it from Horny, who was after it. The portal requires all twenty of Harmonia's Portal Gems for him to pass through. After you acquire all twenty gems for him, he goes through it after defeating the Stone Knights in the outro, and is seen on the other side in the trailer for Dungeon Keeper 3.
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