The Oath Rod is a ter'angreal with the use of making oaths which are physically impossible for a channeler to break. When an Accepted is raised to Aes Sedai, she swears the Three Oaths upon the Oath Rod.
When Moiraine Damodred is exiled from the White Tower by the judgement of the Amyrlin Seat, Siuan Sanche, she is made to swear on the Oath Rod itself. Moiraine repeats the words that Siuan makes her say, though with the adjustment of a personal oath to Siuan herself.
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Changes from the book series
The Oath Rod is an adaptation of the (book spoilers!) from the book series.