Dark Portal (Warcraft II)

Encircled by a ring of towering obsidian stones, the Portal stands some fifty feet above the marshy ground of the Black Morass. Being the original gateway to Azeroth that was opened by the wizard Medivh before the First War, its constant use has increased it in both size and power. It serves as a passage to untold numbers of Orc and Ogre warriors, reinforcing the Horde's already overflowing ranks. The lands around the Portal that were once dead swamps have been transformed into barren soil the color of blood and are now teeming with strange, demonic beasts. This dark perversion of the land is steadily spreading across the continent of Azeroth and threatens to consume the entire world.