Although kyber crystals are naturally blue, green or purple, Kylo clenched his in his fist in order to "bleed" it. Kyber crystals are known for not naturally conducting the Dark Side of the Force, so the bleeding process is a method by which Dark Side users bend the crystal to their will.
The lightsaber's redesign was a byproduct of the bleeding process that damaged its kyber crystal, rendering it dangerously flawed and unstable, and necessitating the lateral vents were meant to prevent the cracked kyber crystal from overloading.
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.
Out of universe answer: The creators wanted to use a cracked crystal, which gave an unstable force field and thus needed side vents, to emphasize Kylo/Ben's unstable nature.
We've known for years now that Kylo Ren's lightsaber crackles and sputters the way it does because the kyber crystal that powers its blade is unstable.
Even though Kylo Ren uses a red lightsaber, harnesses the dark side of the Force, and wears a cape, he is not a Sith. Because of that, he can never hold the title of Darth.
When Kylo Ren did this, he poured so much hate and anger into the crystal, causing it to crack. in the lightsaber itself, the crystal was extremely unstable. This is why his lightsaber has that crackling effect. He also made use of cross guards to make sure.
A crystal embodies the Jedi as the heart of the lightsaber, and pure kyber has no color until it's bonded to the Force user. This process likely resulted in Rey Skywalker's lightsaber being yellow.
Odds of Getting a Black Kyber Crystal
Many have speculated that it's a 1 in a 100 chance. For science, we set out on our own quest to uncover a black Kyber Crystal.
The rarest lightsaber color is black and is known as a Darksaber. Tarre Vizsla created it – the first Mandalorian ever inducted into the Jedi order. For years it was kept safe at the Jedi Temple.
Bleeding Kyber Crystals is an art strictly specific to the Sith. However, a Jedi can purify or unbleed Sith crystals to turn them back to the light side of the force.
Ahsoka Tano, the former Jedi Padawan who aided in the rebellion against the Galactic Empire, is acknowledged as the sole possessor of the white lightsaber.
Construction. In the construction of a Sith lightsaber, individuals partook in a process known as bleeding. By ways of the Force, they would pour negative emotions, such as rage, hate, fear, and pain into kyber crystals. The process would result in the crystals gaining a distinctive crimson or red hue.
The weakest and most harmless type of lightsaber is the one that has been “baby-proofed”: the training lightsabers. As the name implies, this type of lightsaber is only utilized in the context of training very young Jedi to one day become Jedi Masters.
Skywalker lightsaber. Anakin Skywalker carried this blue-bladed Jedi weapon throughout the Clone Wars. After dueling his former apprentice on Mustafar, Obi-Wan Kenobi took Anakin's lightsaber and kept it on Tatooine for nearly two decades.
Rey's lightsaber was a yellow-bladed lightsaber that was constructed by the Jedi Rey Skywalker following the First Order-Resistance War.
Properties. Kathracite crystals were the weakest of the Adegan crystrals and often used to create training lightsabers for the younglings who were apart of the Jedi Order.
The Solari crystal was one of the oldest and most powerful lightsaber crystals of the Jedi Order.
The darksaber does have a kyber crystal just like all other lightsabers do! The crystal is the heart of the saber, giving it not just its color but its energy as well. Kyber crystals are unique, and for the Jedi, the crystal chooses its owner.
Silver Lightsabers
In Star Wars: Episode III – Revenge of the Sith, Obi-Wan Kenobi uses a silver lightsaber when he faces off against his former apprentice, Darth Vader. This represents the end of Kenobi's time as a Jedi and the beginning of his new role as a protector of peace.
Without a doubt, the most notable Jedi with a purple saber is Mace Windu, portrayed in the prequel trilogy by Samuel L. Jackson. Audiences first got a glimpse of the unusual blade in Episode II: Attack of the Clones, making Windu the coolest Jedi in one cinematic moment.
Leia Organa's lightsaber was a blue-bladed lightsaber powered by a kyber crystal in the core of the hilt. It was silver and copper in color and featured mother-of-pearl inlays. Organa's weapon was considered a work of art, having an elegant symmetry with silver and gold hues that evoke to her upbringing on Alderaan.
Affiliation. Kylo Ren's helmet was a combat helmet worn by Kylo Ren, master of the Knights of Ren and the dark side apprentice of Supreme Leader Snoke. Patterned on the battle gear of the Knights of Ren, the helmet concealed Ren's face, hiding his former identity as the Jedi apprentice Ben Solo.
Kylo Ren's lightsaber form was something of a hybrid, which blended three styles together: Djem So, Juyo, and Niman. Djem So used an irregular reverse grip and was meant for practitioners who loved fighting with a more...
Kylo Ren's lightsaber had a cracked kyber crystal, which generated an unstable blade. The excess power was vented out the sides, thus creating a crossguard-like design. The most important and prestigious vessels of the First Order had weapons upgraded with kyber crystals from some secret source in the Unknown Regions.