The only real way to break a lightsaber blade is to destroy the hilt and/or the kyber crystal within it, which is where the beam's light and power comes from. That itself is somewhat easy to do, as long as someone strikes the hilt.
Neuranium. An extremely dense and durable material, neuranium mildly warped the space-time fabric, as noted in the Legends Star Wars: Episode III – Revenge of the Sith novelization. It's all but impervious to scanners and also able to briefly resist the blades of lightsabers.
One of the few things in the galaxy that can withstand lightsabers is Beskar steel. These are precious Mandalorian metals that were used for their armor and some of their weapons. As was shown in The Mandalorian, even a simple weapon like a spear but made out of Beskar can easily best a lightsaber.
A lightsaber could cut through virtually anything, from flesh to blast doors. The only ways to block the incoming attack of a lightsaber was with a weapon made with material that conducted energy, such as an electrostaff, a Z6 riot control baton, some rare metals like beskar, or another lightsaber.
What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature!
What material is lightsaber proof?
The most recognizable lightsaber-resistant material would be beskar, the silver metal featured throughout The Mandalorian. Beskar could only be found on the planet Mandalore and its moon Concordia, and only became rarer after the Empire destroyed much of the system.
This incinerator was a spherical pod-like machine capable of producing temperatures that could melt lightsabers and cause the Kyber crystals within them to violently explode.
The plasma that comes from a lightsaber blade: Can cut through pretty much anything it touches. exceptions include Beskar, or Mandalorian iron, the strongest metal in the galaxy, as well as the scales of a Zillo beast.
Phrik. This rare metallic compound was resistant to lightsaber strikes and was used in the construction of battle armor and weaponry due to its light weight. Phrik was first developed by the Arkanian's, a near-human species which resided on the frozen planet of Arkania.
No, lightsabers can't block bullets. Here's a great video that explains why. The idea was actually put into issue #18 of the Dark Lord of the Sith comic series. During the hunt on Chandar's Folly, Tarkin's team armed up with slugthrowers (firearms) and flamethrowers, two things Vader couldn't block with his lightsaber.
The only possible way for a lightsaber to harm Superman would be if the crystal powering the lightsaber were made of Kryptonite. However, that would still credit the Kryptonite crystal, not the actual lightsaber. Unfortunately for any Force sensitive that encounters the Man of Steel, Superman wins.
Description. Bleeding was accomplished by pouring rage, hate, fear and pain into a kyber crystal by means of the dark side of the Force, until the crystal changed, resulting in the crimson-bladed lightsabers associated almost exclusively with dark side adepts.
One of the most memorable moments involving a lightsaber is when it cuts through a thick metal door. The ability to melt through such materials suggests that the blade's temperature must be incredibly high, likely 20,000 to 25,000 degrees Celsius.
Cortosis-weave armor was an armor which was resistant to lightsabers. It contained traces of cortosis, an ore prized for its ability to create an energy feedback loop which would temporarily shut down a lightsaber.
As the first lightsaber, the Kyber Saber was said to magnify the wielder's Force powers a thousandfold. Upon wielding it, Kantoo discovered its creative potential to reshape landscapes and destroy whole planetary bodies with a single swing.
Beskar, also known as Mandalorian iron or Mandalorian steel, was an alloy that was used in Mandalorian armor and was notable for its high tolerance to extreme forms of damage. In its purest forms, the metal was durable enough to withstand a direct blaster shot and could repel lightsaber strikes.
It's doubtful a lightsaber would pierce Hulk's skin, and even if it could, Vader would have to get close to use it and it would probably take a while. Even a Force choke wouldn't work against the Hulk, as he can hold his breath for a very long time.
It would feel like you got lightly brushed by a piece of plastic, then you would overreact dramatically, and in post they'd make it look like a grievous injury with a laser sword. Probably extremely painful, seeing how most characters cry out if they get hit by one or stabbed.
The next episode begins with her in a medical facility recovering, and there's no hint Ahsoka Tano used the Force to treat her wounds - although that may well be a power Ahsoka is capable of using. This unfortunately makes Sabine Wren the latest Star Wars character to inexplicably survive being stabbed by a lightsaber.
