Kerithwyn is stationed at a healing temple in the far north, near the Forest of Sorrows. She is the first to respond to Talia's summons to help the plague-stricken village of Waymeet. She rides back to the village with Talia, riding double on Rolan.
Kerithwyn is the first to spot the problem of Talia's disintegrating shields. At some point while they're treating the sick, she teaches Talia how to examine the health of a human body in the way a Healer does, which comes in handy later in assessing the severity of injuries.