One, single, very very overpowered jedi/sith apprentice. Who appears to be capable of taking on The Chosen One and the mightiest known Sith Lord, together.
Generally though, Jedi and very big objects don't mix. a group of Jedi pool their powers, taking advantage of the presence of the old Sith temple, to throw a small fleet of Star Destroyers across the system in Darksaber, but this kills the one they channel the power through.