Moeran is the Archpriestess of the Temple and a Phryne clone. Although she is the head of the temple, Moeran has a great hatred for Phryne because the younger clone is "beloved", giving Phryne a greater importance than Moeran.

Spoiler

In the conclusion of the series, Moeran offers Sunda, Clain, and Dias safety while they witness the restart of Fractale. However, Dias uses the opportunity to get close to Moeran, killing her and himself in an explosion.

(Source: Wikipedia)