I don't think it's there just for shits n giggles, if it is an actual reference/clue to something that did happen. The mural at the grove also set me thinking (given, I'm not the most versed in lore so it might be some other thing that happened and I have no idea about).
The murals tells the story of how the Grove was created by fighting of the monsters in the region and eventually how they fought the Dark Justicars who came over to attack the Selûnites at the temple and Blighted village.
