In the ongoing saga of Boba Fett, bounty hunter Din Djarin is still in possession of the mythical Darksaber he got at the end of the second season of The Mandalorian.
The Darksaber is not just a symbol but also a mighty weapon he will have a chance to use in The Book of Boba Fett. Granted, the bounty hunter might not have the skills to win a lot of battles, but wielding the Darksaber seems like a significantly greater challenge for him and Paz Vizla, his fellow Mandalorian.
For instance, as Din collects the bounty on a butcher behind a violent syndicate, he wields the Darksaber in a fight against the butcher's henchmen. He wins, but the weight of the blade is a real struggle for him.
At one point, he ends up burning himself on the thigh while swinging it around during the fight.
When Paz learns that Din is wielding the Darksaber, he challenges him into a fight over its ownership since Paz feels the weapon is his ancestral rite.
After Paz gets hold of the blade, he struggles with it and has trouble lifting it up despite being much stronger than Din. Due to this, Din is able to take advantage of Paz and win against him, and he ends up repossessing the Darksaber.
The Darksaber has varying weight, and this is pretty clear in series. The mystery has been explored in various Star Wars series.
According to The Armorer, the issue with the Darksaber has everything to do with the person wielding it fighting against the blade rather than letting themselves follow the natural flow of the battle.
In the third season of Star Wars Rebels, "Trials of the Darksaber," Kanan is able to realize that there is an energy that flows through the blade and that the wielder has to direct the blade's power. More importantly, the influence of the thoughts and actions of the person holding the blade affects how heavy it is.
When Din got into battles with the Darksaber, he was preoccupied with his thoughts about Grogu. He had left him in the hands of Luke Skywalker when Mandalorian Season 2 ended.
This is why the blade was so heavy in his hands.
The problem with Paz is that his mind is preoccupied with resentment towards Din when he fights him for the weapon. The blade ends up being so heavy for him and costs him the battle.
Even with this apparent downside, there is no denying that the Darksaber is one of the most powerful and most desired weapons in Star Wars. It, therefore, commands a lot of reverence, and anyone who wields it is regarded as the true ruler of Mandalore.
What is clear is that the Darksaber is not just a unique version of the lightsaber. It has unique properties, and even those who wield it might not always make the best of the immense power it has to offer, as Din and Paz have clearly demonstrated.