The class posses way too much protected CC, protected skills and damage. It hasn't been nerfed since way too long. The class in insanely strong in duels & mass PVP.
Here is a list of the skills that needs to get nerfed:

Undertaker
For an unknow reason, this skill is actually bypassing the CC limit. It means he can reset CC you. It has to be fixed.

Prime Fierce Strike
The skill provides good damage and good protections. But the damage reduction in cooldown seems to be very low since it can spam while keeping very good damage.
The damage in cooldown has to get adjust. And the cooldown has to change. It's only 4.5 seconds. It should be 6 seconds instead.

Prime: Frenzied Destroyer
The skill has too much PVP damage. It has only -35% damage reduction in PVP and it also keeps Critical Hit Rate 100% even in cooldown. It's spammable skill, it shouldn't keep damage and critics in cooldown.
The PVP damage reduction needs to change from -35% to -50%, the damage in cooldown has to be readjusted and it has to lose the Critical Hit Rate 100% in cooldown.

Prime Predatory Hunt
Once again, this skill has too much damage, only -35% damage reduction in PVP. It has to change for -60% damage reduction in PVP.

Prime: Raging Thungder & Black Spirit: Prime: Raging Thungder
The skill has ways to much hits for -55% damage reduction in PVP. And for an unknow reason, the Black Spirit has split damage, but even with this, the skill does way too much damage, it also has to be adjusted.

Prime: Fearsome Tyrant & Black Spirit: Prime: Fearsome Tyrant
Both versions of this skill are too powerful. The Prime version has an insane number of hits for only -65% damage reduction in PVP while having stiffs on all hits. And the Black Spirit version has way more hits, while having stiffs on all hits and an insane range.
The skill should lose in range and stiff, especially the Black Spirit version.

Prime: Devastation
Reduce the slow from -30% ATK speed, casting & movement to 10% only.

Prime: Weakling Hunt
This skill gives protected mobility with a CC for a short cooldown.
It has to lose Knockback. It's way too strong for a skill that has a Forward Guard and without any collision.
It also doesn't require stamina which isn't normal. It should require 100 stamina per use.

Prime: Tackling Rock
This skill provides a double Forward Guard for only 4.5 seconds cooldown. The stamina gets consume only during the first animation, and the second animation doesn't consume any.
Make it consume 500 stamina for the whole animation or make it consumes 250 stamina per animation. And change the cooldown for 7 seconds.

Lava Piercer & Prime: Lave Piercer
In Succession, those skills prove an insane mobility to the class while staying protected without any stamina consumption. And it's very easy to temporise their cooldowns.
Both skills should consume 500 stamina and their cooldown should raise to 13 seconds instead of 7 seconds & 10 seconds for Prime version.