[Siths resists my lightning attacks]

Okay thanks, but I'll never get to lvl 50 xd, it's gonna take years. And btw it just says parry or miss when I use Saber Strike.

[Siths resists my lightning attacks]

(I'm lvl 44 Sith Sorcerer)

 

So I'm on the "Fatal Blow" mission and there you've got to kill lots of like "Thanaton sith loyalists" and I've got the normal saber strike attack which deals like 350dmg and all my other attacks are lightning, and all the siths just resists the attacks, so I can't dmg them at all, and my companions die so quickly if I let them fight alone. So I can't do anything. Does anyone know what I can do?