You are very misunderstood, and tried to create a new layer of the seal so that the Moon Lord wouldn't return. The Terrarians kill you a little too much, but you most likely are a Terrarian anyway, so I'm sure it doesn't bother you.
The thing is, we mobilize so easily that even if there was a significant threat to us, we could simply run away into another dimension VERY easily. If someone does end up following us so persistently when nothing can kill them, we can mark them with a Dimensional Anchor which roots their position in the planes so they can't follow us anymore. It bypasses wards as the Dimensional Anchor is only debatably harmful at the best of logic.