During the battle in the flooded temple, he had observed Cassie's artificial Echo in action. Even though it did not seem that powerful, that was only because their enemies that time had been of both a higher Rank and a higher Class than the blade mannequin. Sunny would not have wanted to face that thing in battle as an Awakened.
The most impressive thing about it, though, was the very fact that it was artificial.
After interrogating Cassie and Nephis on the topic, he had found out that the forgemasters of Clan Valor were capable of creating not only Memories, but also Echoes. Making one was an extremely long process, though, and one that demanded a lot of precious resources. So, there were actually very few artificial Echoes in existence, all of them belonging to the most valued members of the clan.
