First, the user may be referring to a novel, a fictional work or a fan-written work. The Mother Lover Society could be an organization or group in a story, and Chapter 5.3 is the corresponding section in the story. In this case, the user may want an analysis or summary of this part of the work, but due to the lack of original text, the information is not sufficient for this task.
Fans often discuss the "motherly" or protective nature of certain characters (like Venat/Hydaelyn) in the broader context of the game's later chapters, which might be why the "Mother Lovers Society" moniker was used in the post you found. Mother Lovers Society -Ch. 5.3-
What are you aiming for (dramatic, romantic, or something else)? First, the user may be referring to a