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They have been implied to be very tough and resistant to attacks, but who could destroy them? Break through them etc. Let's not go above Thor shall we..?

Maxam did it once. He just kept growing inside one in the Infinity Crusade and the bubble/Sue gave in.

So the big guestion is? Who's able to pierce her forcefields?

1) Physhical strength
2) Energy attacks
3) Other way

The Hulk has some feats breaking through energy/force fields.

Is the strength of Sue's forcefields based on willpower like GL's abilities?

Gladiator has done it before. It's a mental power for her.

She actually feels the feedback from the forcefields so when a guy like Gladiator (as shown before) hits them its like getting hit on the head with a rock.

However, if someone went after her kids, nothing is going to stop Sue from kicking the crap out of them with her fields.

Sue is more powerful than most Marvel heros are and she is just shy of cosmic level