"I do not, no." Luna adopted a thoughtful expression. "I doubt your theory that it is an enemy of Equestria with a common interest in keeping Sombra down, yet I can find no other explanation as to why this mystery creature would wish to remain hidden." After a moment of thought, she continued. "I… I suppose it could be Chrysalis. We did lose track of her after her invasion was repulsed. She could've reestablished her hive somewhere in Frozen North, and now sees Sombra as a potential threat… It could've been her or one of her subjects that assisted you with the shield spell, at the very least."