Merch O Obaith was a secondary identity used by Nimue Chwaeriau.
Physically, Merch appeared to be a slender woman with vivid blue eyes and extremely dark brown hair with auburn highlights. However, as a PICA, she was capable of physical feats beyond the capability of any Safeholdian.
The Merch identity was used by Nimue to maintain contact with Lady Karyl Rydmakyr, Dowager Countess of Cheshyr, and with several officials in Chisholm while they were dealing with a conspiracy led by a group of Chisholmian nobles. (AST)
In Welsh, "Merch O Obaith" means "Daughter of Hope".