My KOTET Rankings
Oh SWTOR...
https://www.youtube.com/watch?v=5T5rCSmduaY
You shall be missed.
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So, on to the rankings.
Arcann - Confirmed to have grown in power from the last chapter. His capabilities are greater then dominating the Outlander and blocking a vast majority of the energy Valkorion's lightning generated. As of KOTET he is able to stalemate a chained Vaylin in sabers.
Level: <= Vader
Senya - Able to augment herself to the point that when paired with her skill she is capable of matching a chained Vaylin in sabers not long before KOTET, the feat was replicated by Arcann not long after.
Level: = SoD Maul.
Vaylin ( Chained ) - Capable of stalemating Arcann in sabers despite him being far more technically skilled and himself extremely powerful. Able to overcome dozens of Imperial Knights in an unknown manner prior to KOTET. Capable of physical feats to scale with beings like Dooku and Vader prior to KOTET. Should logically have grown at an equal or greater pace then her brother.
Level: = Vader
Vaylin ( Unchained ) - A threat to a weakened Valkorion. Oneshot both Senya and Arcann while causing strain to the Outlander with a continuous blast.
Level: = Plagueis/TPM Sidious.
Outlander: Resisted unchained Vaylin's continuous Force blast. Defeated Arcann and Senya in the DS version ( logically the canon version should also be capable of such a feat ).
Level: = Revan.