Bore

From A Wheel of Time Wiki

In the Age of Legends, Aes Sedai researchers at the Collam Daan discovered a region of the Pattern with what appeared to be an undivided source of the One Power separate from the True Source. Initial research suggested that this energy could be used by either gender without many of the known limitations of the One Power.

An attempt was made to access this new energy source by boring a hole in the Pattern. The resulting explosion destroyed the Sharom of Collam Daan. What the researchers had found was actually the prison of the Dark One. The resulting hole is known as the Bore, and although it has not allowed the Dark One to escape, it does allow him to influence the world.

The Bore was later sealed by Lews Therin Telamon in an attempt to imprison the Dark One. The backlash from the Dark One against this act tainted saidin.