“Damage from the Diamonds.”
This simple drawing, and the eerie music that accompanies it, makes this one of the most sinister images we’ve had in Steven Universe. From this, we can understand how strong the Diamond Authority really is, like the Diamonds are some kind of terrible deity.
When the Diamonds finally start showing up in person, and the Crystal Gems have to fight against them, I believe they’ll be in an entirely different league. Yellow Diamond is clearly still angry about Earth, and we can infer the others are just the same, and there will be Hell to pay.