Eithan Arelius is an Archlord on Cradle. One of the main characters, he acts as the mentor of the group having adopted both Yerin Arelius and Wei Shi Lindon Arelius into his family.
Eithan Arelius was one of the advisers of the Tiberian Arelius, the Arelius monarch, before he (the monarch) died. He was born on the Rosegold continent but he lived most of his childhood in the Blackflame empire on the Ashwind continent. He was able to do this because of a portal that opens once every ten years between the two continents. He returned to the Blackflame empire in his mid 20s and became the patriarch of the side branch of the Arelius family. At this time, Eithan was a underlord. This was also after Tiberian's death.