The one force user Boba Fett feared.

Being a battle hardened and fierce Mandalorian foundling, as well as the son of Jango, Boba Fett was almost never scared of his enemies, even if they were empowered by the force… That was, until he was given a bounty by Darth Vader. While hunting his target, Boba came across the obliterated corpse of a Gorog, one of the most fearsome and gargantuan creatures in the galaxy. Seeing this, Boba knew it was killed by the man he was hunting, striking fear into him.

His target was Galen Marek or Starkiller, the immensely powerful secret apprentice of Darth VAder. Knowing that he was no match for the sheer power and fury of Starkiller, he instead focused on Marek’s loyal ally Juno Eclipse.

Although Boba and Vader eventually managed to defeat Starkiller, Boba recounted the event as being the most scared of a force user he has ever been.