Klaithus Vile

Here you can find a useful guide to understand the level of power and mastery Klaithus Vile shows in various aspects of his repertoire.

1- The most basic level, something that is expected on the average Jedi Knight\Lord of the Sith

2- A higher level, the power that is wielded only by Jedi council masters or Darths of the Dark Council

3- Considerable high level, held only by low\mid legends in the Star Wars universe (Example: Revan, Malgus, Satele Shan, Obi-Wan, Arkann, Vaylin)

4- Transhuman level, a power only a few mortals can hope to wield one day. In terms of saber mastery, an example would be prime Darth Vader and Starkiller, while in terms of force mastery, Legends Palpatine or Prime Valkorion.

5- Divine level, a power that no mortals could (supposedly) hope to wield, no matter what. Entities that fit this description are Abeloth or Legend Luke Skywalker.

Primary Saber Style
Klaithus was, most probably, one of the best wielders of the VII form, the infamous Juyo, a very aggressive style that focuses on channelling negative emotions to fuel the power of each strike. Contrary to many users, however, Klaithus imposed strict discipline on his emotional outbursts, making his style a precursor form of the more (and later) refined Vapaad form. To do this, every time he entered combat he made a conscious effort to define his targets, channelling his rage and hatred only towards them. This style, effective to not make him lose ground to the dark side, effectively gave him a slight handicap every time he was fighting for "sport" or training. At the same time, however, allowed him to maintain unnatural calm and concentration during combat, effectively giving him an edge over extremely emotional dark side users.

Stamina
Klaithus Vile stamina is famous across all the galaxies. He was stabbed, cut, burnt, shot, tortured, mentally invaded, poisoned... and yet he still stands, his power more strong than it ever was. His body has sustained such amount of injuries and psychical stress that he become incredibly resilient towards them, and his mind is now shielded like a start fortress after he finally got rid of the parasite that Valkorion, the former Sith Emperor, was. To even add more, he used many secret sith rituals to give him even more power than before, effectively moving him very far up on the human scale.

Force Flames
Force Flames are a particular usage of the force that allows Klaithus to create a black-violet fire that can be effectively used as a weapon against living targets (it does not affect inorganic materials). Firstly discovered during his first (and only) episode of Rage, it has been refined over the years thanks to the knowledge of the dark arts that Valkorion "left" in Klaithus mind. While these flames can be extinguished by normal means (it doesn't require oxygen to operate, though), it is also able to ignore all non-organic protection, meaning that armours, shields, or even Mandalorians plasma covers are completely ineffective to stop them.
This power is extremely vicious against force users, as the flames will devour their energy as fuel to burn with even more strength. A force user that survives an encounter with such an experience could risk losing his connection to the force permanently.

Dark Transfer
Dark Transfer is the ability to use the Force to share life energy between two individuals, on a level so deep that is said it could allow an expert user to revive the dead. Klaithus become obsessed for months with this specific technique after the death of her lover, Vette, at the hands of Vaylin, but in the end, his effort was unable to bring back his wife from the grave, since the emotional connection was so strong he couldn't concentrate well enough to do such a task. Now he moved his attention on the topic, but he's still capable of using this technique when necessary, allowing him to take back anyone, as long as he\she died quite recently.

Farsight
Farisight is the usage of the force to allow the user to see over long distances in terms of space and time (both an effect of clairvoyance, prediction and psychometrics). Klaithus is, by far, the most capable user of this ability, his eyes capable of seeing events happening even on many, many galaxies far away from his position. For some reason, however, his clairvoyance is utterly incapable of seeing both past and future events (aside from very rare sparks of events, totally free from his control), so his sight can only contemplate what's happening "there and now".

The Rage
The Rage is an ability unique to Klaithus, and lucky us for that. Essentially, this power comes out only after the man has experienced a severe emotional blow, powerful enough to make him lose his mind out of pure ire and bloodthirsty rage. This causes his body to boost all his psychical skills to the extreme (in-game term, his Stamina and Primary sabre style get a +1 until The Rage stops) and also enhances his force powers as well (He almost annihilated the entire Odessen with his Force Flames). As a downside, however, his mind loses focus and even sanity, becoming an animal that only wants to brutally massacre everyone who made him lose his temper so much. His force also comes out from his body at abnormal rates, devastating the area around him (enough to make Valkoryion look terrified at such a display of power).
So far this happened only once after Vaylin killed his wife Vette, and Klaithus has no control over it (nor he wishes to: the last show almost cost him the entire Alliance).