Donder172
Three Thousand Club
I doubt it. All Nihilus really has is his extremely powerful skills in absorbing life from people. To an extend that he can take life from all the inhabitants of an entire planet. Sidious might be a challenge, but Abeloth would most likely win in the end.Not even bringing other series into this, but wouldn't the EU's Darth Sidius or Darth Nihilis alone defeat Abeloth?
As for OP char, I would also say Abeloth. It is not even sure if she was actually killed.