Choedan Kal

From Wotpedia

The Choedan Kal are a pair of Sa'Angreal that were created in the Age of Legends. The actual device is a giant statue, one of which is a male, one of which is a female. One is located outside of Cairhein. The other is located in the Seafolk islands. They are accessed through the use of 2 special "key" Ter'Angreal. There are supposedly 2 of these for each gender. Though Rand al'Thor possess one pair. They are made to be used most effectively when a man and a woman are channeling together. Lanfear has said that together, they can be used to break the world again and remake it in one's own image.