CoachRTM said:
"So many spells cast at once"
Referring to when Wanda went bonkers and took over the town?
Referring to another time when spells were cast by someone else?
If the former, Wanda created the town, Agatha found out and created her creepy basement next door.
If the latter, Agatha is probably involved in a sinister plot to draw Wanda to the town and to the house next door.
At least that would be my rudimentary understanding of it.
Agatha explained that mind control is difficult, and that transmutation (changing stuff's shape) "takes years to master."
So she was drawn to the fact that Wanda did those things on a massive scale, which should be very difficult/impossible
...and it appears she created her own basement and put those protection spells on it
Rough, Tough, Real Stuff. Texas A&M.