Could be the goblin girl or any one of the other hundreds of thousands Mara killed...
Or they could just be walking through a graveyard in the rain.
But more importantly, first panel; "I can feel her."
"Me too."
Lia can feel her conscience, and Fi can too? Did Fi and Mary unite already? It's a good thing, but... well, I feel cheated a bit.
No, wait, not cheated. I dunno, it's an easy leap, I guess. I was expecting more wrangling, but I think we saw the whole of both sides of the argument in the last panel of the last page anyway.
They both look so peaceful and happy, dammit.