Sister Lamia

Sister Lamia is a monster nun who is devoted to Ilias, however her status as a monster makes this seem difficult.

She first encounters Luka and greets him on his way to the city of Grand Noah, disguised as a human, however Alice calls her out to reveal her true form. As Luka draws his sword, Sister Lamia reveals to be a devotee to Ilias and does not attack. She informs them that Noah is a particularly friendly region towards monsters and tells Alice that she has no need for her own disguise. However, the south is not monster-friendly which why she has her disguise. Putting it back on, she wishes them well and leaves to the south, attempting to spread Ilias's teachings.

Judging from recent screenshots, Sister Lamia appears to be an enemy in the upcoming Chapter 3.