You're telling me to put osme facts on the table? I don't think you're one to talk as you almost never make any comments towars the topic at hand.
I'd tempted to laugh at this semi-implication, but I'm not sure what you're trying to imply, nor if you're making coherent conversation and not just irrelevant chatter.
The fact is that there are to many holes in the case for Traya being able to use her instakill for it to be taken seriously. Why didn't she use it on Nihilus when he and Sion were rebelling against her?
Nihilus cannot be drained, insofar as he's a hole in the force. We've been evidenced with what happens when one drains an empty hole, and it left Nihilus weaker and able to be defeated by the Exile and his posse.
I'd argue that she isn't quite clued to their intent. She knows somethings up; and she ignites her lightsabre when Sion does so, but she doesn't throw any force powers at them whatsoever. Then, Nihilus drains her and she gets tooled.
Why didn't she use it against Sion on Peragus?
I hardly think she was even wanting Sion to die. She has a vibroblade at the ready, and doesn't attempt to kill him when he has his back turned, she doesn't let off any force attacks at him whatsoever and when he ignites his sabre and she has a weapon at the ready; you'll notice that he swings as slowly as ever, and she doesn't even attempt to block him.
Why didn't she use it against the Exile on Malachor?
^ See above. One cannot drain a wound in the force without exponentially weakening yourself.
And the main problem I have with the idea that she can use it whenever she wants is that wouldn't have needed the Exile, or anyone else, (the people at the Trayus Academy) to accompish her goals if she was as powerful as that.
Why? Her primary goal was to destroy the force. How - pray tell - wouldn't she need the Exile for this? Furthermore, Traya's a manipulator, not a gun-ho fighter or flat-out warrior. She's far more stealthy and sneaky.
She killed the three greatest Jedi with a wave of her hand. One of them, Kavar, is believed to have been nearly as good as Malak in saber combat.
It's pretty clear that she demolishes them all in the force; evidenced by how she waltzes in, blasts all three to the ground and then slams Vrook back like a ragdoll. And how Kavar's lightsabre abilities are relevant to this fight, one will never know . . .
No one alive would be strong enough to stand against her. Why didn't she just go around and pwn all of the Jedi and Sith on her own?
Um, did you play the game; Glentract? Or did you accidentally miss the swathes of text that deal with this. She doesn't want to destroy the Jedi and Sith; she - ideally - wants to educate them. Furthermore, her ultimate goal is the destruction of the force. If she were so dedicated on destroying the two orders, why not destroy the source of their power instead of hunting them down one by one?
If you want to argue Traya can use her instakill you need to prove it.
On the contrary, you need to come up with some actual proof; not a load of re-hashed and fatally wrong assertions.