The Great Ghost Dance was a powerful magic ritual, led by Daniel Howling Coyote, used by the NAN to cause Mts. Hood, Ranier, St. Helens, and Adams to erupt simultaneously, the magical equivalent of nuclear war. It occurred on Aug 17, 2017, at 10:32 am. After the Great Ghost Dance, the United States admitted defeat and drew up the Treaty of Denver. (SR3, And So It Came To Pass)
The mana spike at the site of the Great Ghost Dance was later used by Darke to create a bridge in astral space to the metaplane where the Horrors reside. (Dragonheart Trilogy)
References
- Shadowrun Third Edition, And So It Came To Pass
- Dragonheart Trilogy
- Shadowrun Fourth Edition (p. 25)