'Ah. So that is how it works.'
Initially, Sunny had suspected that the mysterious Shard Memories were just rewarded to those who managed to slay certain powerful Nightmare Creatures who dwelled close to the headless statues.
The truth, however, turned out to be more complicated. The creature itself, most likely, did not even matter — it was the act of vanquishing a powerful foe after coming in contact with a statue that summoned the Memory from oblivion.
That was why they had received the Midnight Shard before even learning about how important these ancient monuments were. Sunny, Nephis and Cassie had taken shelter atop the statue of the ancient knight and killed the Carapace Demon long after.
But no, that didn't make a lot of sense. If this was true, Sunny would have received another Shard Memory after defeating the Corpse Eater. So… not any powerful abomination would do.