The hedgehog is a ter'angreal that was stolen from the White Tower by Liandrin's Group of Black Sisters.
The ter'angreal is in the shape of a wooden carving of a hedgehog, no bigger than the last knuckle of a man's thumb.
Any woman who tried to channel through it went into half a day of peaceful dreamless sleep, and it could be used to trap others as well.
It was left by the Black Ajah who fled the White Tower as a trap for Moiraine Sedai in Tear. It was broken by Perrin Aybara to rescue Faile, who had instead triggered the trap, from its effect.
- ↑ The Dragon Reborn, Chapter 25
- ↑ The Dragon Reborn, Chapter 53
- ↑ The Dragon Reborn, Chapter 55