Challenge Mistress Heriau Cadarn is an elf who can be found at the Tower of Voices and the Max Guild in Prifddinas. She is a member of the Cadarn Clan. Like Challenge Mistress Fara, she will give out rewards for daily challenges, and allow players to block challenges for skills they have mastered.
If you talk to her, she says that she is a member of the Cadarn Clan and a direct descendant of Baxtorian.
- "Heriau" in Welsh means "challenges", making her translated name "Challenge Mistress Challenges".