Weakest who can break Magneto's shield using...

1. Pure physical force - Classic Juggernaut (I see that one going down just like it did in a couple of What Ifs). Eventually guys like Thanos, enraged Hulk, Gladiator etc would probably just bust through. Depends how many hits you allow.

2. Energy blasts - probably a lot of herald/cosmic types could do it. Again, it would take some longer than others.

3. Other (explain)
Thor's hammer. I don't count it as pure physical force because of the enchantments. We've seen Thor absorb Mag's shields away through magic, Thor breaking down Mag's shields by bludgeoning away, but also Mags deflecting a hit from the hammer. But it's the same as Quasar's shields - we've seen them deflect the hammer several times, but when Thor was serious he has broken them on occasion. There is a huge difference between a casual hammer blow and when he really cuts loose - add to that the magnetism absorption and the hammer will get through.

Quasar, and probably a lot of the heralds, by absorbing the energy away. Maybe Vulcan the same way.

Blackbolt unleashing his voice.

Someone mentioned Persuader's axe. Add to that maybe Ebony Blade.

Other than that, probably a lot of magical attacks, magical artifacts. Certain magical entities can just pass through, though not strictly break the shields.

Gravity attacks - again, not necessarily breaking the shields but they would pass right through an e/m based shield anyway.

Captain Marvel (Monica) showed the ability to transform into neutrinos at one point, don't know how. That would go straight through e/m shields though not break them.

Leech for other.

Bump. Alberto, give your precious advise here.

Stop.

Hax.

Haxie hax of hax.

Anything you can't explain and can't let another character do it, its hax.

"Jimmy Olsen has such a hax camera, nobody can match his photos".

Originally posted by Omega Vision
1. Pure physical force

2. Energy blasts

3. Other (explain)

Since the OP is long gone...I'll say ranges, and not specifically the lowest.

1.

Assuming one strike, somebody in the Thanos/Superman range.

Assuming multiple strikes [less than 10, but more than 1], Thor/Wonder Woman range.

2.

Assuming one strike, Hal Jordan or Orion.

Assuming multiple strikes, Surfer or Firestorm.

3.

See: Monica.

What about Klaw for 3?

Magneto's shields have also protected him from being affected by TK, both from Phoenix and exodus, so stiff like sound waves, gravity, neutrinos won't bypass it IMO

That means that inside his bubble, Magneto is deaf and blind etc.

Originally posted by DarkSaint85
That means that inside his bubble, Magneto is deaf and blind etc.

Sue becomes 100% invisible, including her optic nerves... and she still sees everything, lol. Comics.

Anyway, Magnus' shields are tough as f*ck, but they can and have been breached.

Originally posted by StiltmanFTW
Sue becomes 100% invisible, including her optic nerves... and she still sees everything, lol. Comics.

Anyway, my anus shields are tough as f*ck, but they can and have been breached.

Fixed.

😂 😂 😂

Good one.

"Pure physical force" would have to be something far beyond the combined strength of Thor and She-Hulk:

Thor was weakened due to his brittle bones there.