Here's what you need to know about Ayende Rahien:
* She is a powerful and ancient spren (a spirit being) who serves as a Highspren, a type of spren with special powers.
* She is associated with Oathbringer, one of the three main weapons of the series, and the Windrunners, one of the ten orders of Knights Radiant.
* Ayende is a major player in the series, playing a critical role in the events of "Oathbringer", the third book in the series.
If you're looking for information about the character Ayende, you'll need to look at resources related to the "The Stormlight Archive" series.
However, if "Ayende" is not related to the book series, it's possible it could be a:
* Name of a person
* Misspelled word
* Something else entirely
To give you a more precise answer, please provide more context about where you encountered the term "Ayende."