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|Region||Isle of Balfiera|
The Direnni Tower, also known as the Adamantine Tower, Ada-mantia , Ur-Tower  and Tower Zero, is a tall, circular, and ancient tower at the highest point of the Isle of Balfiera in the Iliac Bay. The Tower was used as a fortress, prison, and palace by the Direnni Hegemony, but its true purpose has remained a mystery. The latest magical divination of its age places its construction around ME 2500, making it the oldest known structure in Tamriel. The tower has been modified several times over the years, but the cylindrical core of metal has not been touched and is rumored to extend as far into the ground as it does protrude above it, but its depths have never been thoroughly explored.
According to historical lore of the Dawn and Merethic Eras, the Direnni Tower was created by the Aedra for a place of discussing the creation of Mundus. The tower was then used by the Gods for discussing the punishment of Lorkhan for his trickery of conceptualizing Mundus; the decision being to cast Lorkhan's heart from the tower and into the mortal world below. When Magnus departed from the near-formed Mundus, the Gods that followed him abandoned the tower, leaving behind the secrets associated with it.
- Aurbic Enigma 4: The Elden Tree — Beredalmo the Signifier
- Lord of Souls — Gregory Keyes
- Tower of Adamant — Hrerm House-builder, Bard's College, Solitude
- Pocket Guide to the Empire, 3rd Edition: All the Eras of Man, A Comprehensive History of our History — Imperial Geographical Society, 3E 432
- Before the Ages of Man — Aicantar of