I would like to destroy a Dyson Sphere so it leaves big junks of scrap metal with no habitable zones left. But still with enough structure to hold Building sized blocks.

The destruction shouldn't be man made.

To The Sphere: From the sun to the outer layers

1. Habitable Zone: cities, agricultural farms, places
2. Support Zone: Electrics, water supply first structure level
3. Main structure  : the other structure levels where everything is build on.
4. Spaceports and Cargo System: An infrastructure on the outside where Spaceships can be dock and a network of "Trains" transport Cargo
5. Shield pylons: For shielding the whole Thing against little meteoroids and ships.

I've described the hull of the sphere about 200 - 500 meters thick.

What could made such an impact on the Sphere? How would the Destruction went on after the Initial "blow" hit the sphere?

ETA: This question has been refocused slightly, as such some of the answers below are a little out of date.

I would like to destroy a Dyson Sphere so it leaves big chunks of scrap metal with no habitable zones left, but still with enough structure to hold building-sized blocks.

The destruction shouldn't be man made.

Sphere Description (ordered from the sun to the outer layers):

1. Habitable Zone: cities, agricultural farms, places
2. Support Zone: electricity and water supply, first structure level
3. Main structure: the other structure levels where everything is built on.
4. Spaceports and Cargo System: an infrastructure on the outside where spaceships can dock and a network of "Trains" transport cargo
5. Shield Pylons: for shielding the whole Thing against little meteoroids and ships.

I've described the hull of the sphere about 200 - 500 meters thick.

What could make such an impact on the Sphere? How would the destruction progress after the initial "blow" hit the Sphere?

ETA: This question has been refocused slightly, as such some of the answers below are a little out of date.

I would like to destroy a Dyson Sphere so it leaves big junks of scrap metall with no habitable zones left. But still with enough struckture to hold Building sized blocks.

The Destruction shouldn´t be man made.

To The Sphere: From the sun to the outer layers

1. Habitable Zone: cities, agricultural farms, places
2. Support Zone: Electrics, water supply first structure level
3. Main structure : the other structure levels where everything is build on.
4. Spaceports and Cargo System: An infrastructure on the outside where Spaceships can be dock and a network of "Trains" transport Cargo
5. Shield pylons: For shielding the whole Thing against little meteoroids and ships.

I've described the hull of the sphere about 200 - 500 meters thick.

What could made such an impact on the Sphere? How would the Destruction went on after the Initial "blow" hit the sphere?

I would like to destroy a Dyson Sphere so it leaves big junks of scrap metal with no habitable zones left. But still with enough structure to hold Building sized blocks.

The destruction shouldn't be man made.

To The Sphere: From the sun to the outer layers

1. Habitable Zone: cities, agricultural farms, places
2. Support Zone: Electrics, water supply first structure level
3. Main structure : the other structure levels where everything is build on.
4. Spaceports and Cargo System: An infrastructure on the outside where Spaceships can be dock and a network of "Trains" transport Cargo
5. Shield pylons: For shielding the whole Thing against little meteoroids and ships.

I've described the hull of the sphere about 200 - 500 meters thick.

What could made such an impact on the Sphere? How would the Destruction went on after the Initial "blow" hit the sphere?

ETA: This question has been refocused slightly, as such some of the answers below are a little out of date.

So i am Gamemaster of an RPG, the location where the party is, for the last few months the party have been on a Dyson Sphere.

Now I would like to motivate them to move onto another place. So I need to destroy it on the best possible way: I thought some nice meteoroids!

So my Question is: How many meteoroids do I need to shoot? and how big do they need to be, to effectively destroy **all the habitable areas ** of a Dyson Sphere? How would the Scrap of the Sphere react if the structure is out of balance? Would the whole stuff just wobble around like waves on a pond? How could I explain something like that so it sounds possible?

"A big meteoroid just appeared on the screen" - seems to be to easy for a civilization that made an structure that is bigger than a Sun.

I would like to let them screen the scrap pieces in a later adventure but not if that sounds to artificial.

To The Sphere: From the sun to the outer layers

1. Habitable Zone: cities, agricultural farms, places
2. Support Zone: Electrics, water supply first structure level
3. Main structure : the other structure levels where everything is build on.
4. Spaceports and Cargo System: An infrastructure on the outside where Spaceships can be dock and a network of "Trains" transport Cargo
5. Shield pylons: For shielding the whole Thing against little meteoroids and ships.

I've described the hull of the sphere about 200 - 500 meters thick (according on what point of the sphere the players were at the time).

EDIT: The Core of the Question is "what could possibly destroy a Dyson Sphere" not "how should I destroy it"

I would like to destroy a Dyson Sphere so it leaves big junks of scrap metall with no habitable zones left. But still with enough struckture to hold Building sized blocks.

The Destruction shouldn´t be man made.

To The Sphere: From the sun to the outer layers

1. Habitable Zone: cities, agricultural farms, places
2. Support Zone: Electrics, water supply first structure level
3. Main structure : the other structure levels where everything is build on.
4. Spaceports and Cargo System: An infrastructure on the outside where Spaceships can be dock and a network of "Trains" transport Cargo
5. Shield pylons: For shielding the whole Thing against little meteoroids and ships.

I've described the hull of the sphere about 200 - 500 meters thick.

What could made such an impact on the Sphere? How would the Destruction went on after the Initial "blow" hit the sphere?