Lvl 65 Berserker with some thoughts and suggestions for succession rework:

Overall the class lacks an identity. It's not really tanky nor evasive. It doesn't really function like a berserker in terms of gaining damage when enraged or a giant in terms of defensive capabilities. I would like to see more of both to be honest. Like the theme is pretty cool and transforming into a beast and all but it lacks a general theme when outside of beast mode. I think it being a giant would make more sense to move into a damage and DP/HP direction rather than evasion as giants wouldn't be super evasive.

1. General:

1.1 Fort of giant and prime Fort of giant are outdated based on HP developments in BDO. These have deteriorated over time to a point where it is not really worhty of a class specific bonus. The succession Zerk doesn't really feel like a tanky character in BDO compared to other melee classes like Striker/Mystic/Gaurdian/Nova. I think a good idea would be to double Fort of giant's base HP and add 10 DP and to rework Prime Fort of giant into something completely different. The defintion of a Berserker: an ancient Norse warrior who fought in a wild frenzy. Add a succession ability called Prime: Berserking that enables the character to fight in a wild frenzy. Something like a Stacking buff that grants 1% attack speed, 1% movement speed and 1% critical hit damage on hit, up to 15%, lasting 10 seconds and refreshes on hit. This would bring it closer to the definition. It can scale slower like 0.5% per hit too. Pretty cool idea to give the class an identity. 

1.2 All healing skills are outdated too resulting in the flat HP amount being deteriorated over time to a point where the healing received doesn't really warrant the risk for standing still trying to get through the lenghty animations. Increase HP amounts (or make it % based) and reduce animation times to actually provide sufficient healing. Currently the healing is quite low for how long you are locked in an annimation. I only use Wailing Beast for a means to heal as the others take way too long. Either make these effective heals too or change the skills to offensive or defensive skills that can add to fighting in a wild frenzy or provide some tankyness. Again these skills are just very slow and nothing like a wild frenzy in my view and neither do they provide good healing. They all have a 45s cooldown. Make one or two that are effective with shorter annimations and reduce the cooldown and use the other two for different skills. See point 2.6 in Skill changes below.

1.3 Grapple resistence due to it being a giant: I think the large giant like character would be difficult to grapple due to the size and hence should get some resistence to being grabbed. It can be added to Increase Grip and the name can be changed to make more sense. Something like Giant Stance. 

1.4 To increase pvp abilities againts evasion classes like sorc, etc I think it could help a great deal if there is a Prime Grab that can grab through an iframe seeing that it is the grab specialist class. Just a thought. Not sure if that is even possible or give it a chance to succeed through an iframe. 

Skill changes:

2.1 Feral Rage:

2.1.1 Increase the movement speed to match Raging Thunder

2.1.2 Apply Raging Thunder skill add on effects when used just like other classes. 

2.2 Prime: Fierce Strike: Increase the PVE damage. This skill has a fairly small hit box for being one of the main DP debuff skills and lacks damage in PVE. Overall in PVE I don't really want to use it seeing that it is not really effective in applying the debuff in a larger area to mobs I am rounding up to kill with one of the spins and it doesn't really do damage either.

2.3 Prime: Predatory Hunt: Honestly this skill needs a lot of work:

2.3.1 The jump time is very slow and the damage is quite bad. Like this does not depict an ancient Norse warrior fighting in a wild frenzy. It is anything but wild. In PVE it is more effective to jump into an object to trigger the collision annimation and then beastly windslash out of mid air than it is to actually complete the jump. The collision annimation plus Beastly Windslash executes faster and does more damage. Like I literally try and jump into objects or jump uphill to just get it out of the way as soon as possible.

2.3.2 The jump impact or landing annimation is too slow and prevents smooth transition into other skills for the following skills:

2.3.2.1 Predatory Hunt -> Feral Rage (Please fix this one I hate it a lot)

2.3.2.2 Predatory Hunt -> Fierce Strike

2.3.2.3 Predatory Hunt -> Predatory Hunt

2.3.2.4 Predatory Hunt -> Prime: Fearsome Tyrant

2.3.2.5 Predatory Hunt -> Prime: Devastation 

2.3.2.6 Predatory Hunt -> Prime: Ancient Wave

It should be as swift as the Predatory Hunt -> Prime: Storming Beast transition.

2.3.3 Increase PVE damage as it does not really feel impactful. 

Rather reduce the number of jumps or take away the bound effect after the second jump but please just make it significantly faster. It is so slow and predictable that some classes will just grab me in flight or on impact. The skill has a 20s cooldown just to be wildly predictable, slow and not super effective in engaging compared to other classes. Again nothing like a wild frenzy.

2.4 Prime: Tackling Rock: There is an awkward stumble at the end of the skill movement motion that prevents fluent motion into other skills. Similar to the issue I have with Predatory Hunt.

2.4.1 Prime: Tackling Rock -> Predatory Hunt. 

2.4.2 Prime: Tackling Rock -> Ancient Wave

2.4.3 Prime: Tackling Rock -> Devastation 

2.4.4 Prime: Tackling Rock -> Feral Rage (Please fix this one too)

Should function similar to Prime: Tackling Rock -> Beastly Windslash or Prime: Tackling Rock -> Fierce Strike.

2.5 Prime: Storming Beast: Honestly I love this skill. It has such a cool feel to it when you are walking around stomping stuff. My ideas for it would be to add a DP debuff to the skill to provide an easier means of applying a DP debuff. Can be PVE only if there are PVP concerns (Rather than the small hit box of Fierce Strike or the last hit of Beastly Windslash) and to increase it's damage for PVE to match that of Frenzied Destroyer or Beastly Windslash. Right now I find that when I run out of Skills I end up with Frenzied Destroyer or Beastly Windslash and I just spam them. Would be great to add some foot stomps in there. Just provides more selection of skills to do.

2.6 Absolute: Beast Roar and Absolute: Wrath of the beast: Remove these skills. NOT fighting in a wild frenzy...Standing still, not healing enough and stuck in an annimation does not really classify as a wild frenzy to me. I have locked it for over a year now. Replace these skills with an offensive skill to be more of a wild frenzy. Ideas for new skills: a spinning slam sequence (Like a jump and spin in place on landing), a body slam, a forward rolling spin in a line, a brawling tumble, a manic axe throw in an area in front of the Berserker, sacrifice HP for damage, sacrificeHP and DP for movement speed and attack speed, activateable frenzy buff that applies a damage boost in exchange for a life degen/flat life amount. Just anything that is not another slow annimation without doing much. Other classes are being impactful with skills. The only skill I find impactful is an Ancient Wave after a Fierce Strike.

2.7 Feral movements: Beastly windslash feral movement -> Change to have the same distance movement as regular Beastly Windslash to not have confusion as to how far you are going to go with the same skill execution in different forms. I always find it annoying to tumble really far during the feral movement. Would be great if it could be a consistent distance between forms.

2.8 Prime: Fearsome Tyrant: Reduce the cooldown to 30 seconds. Increase the healing. The 350 HP is based on old HP levels. Should probably increase this by like 25-30% or so to comensate for HP increases since the initial 350 amount per second was established. Should probably convert to HP % to avoid it losing effectiveness over time again.

2.9 Prime: Ancient Wave: Increase PVE damage. Large difference between PVP and PVE damage. Just does not have an impact in PVE compared to the long cooldown. Also consider reducing cooldown a fair bit.

2.10 Prime: Raging Thunder: Increase PVP damage. Apply DP debuff on all hits. Right now Succession Berserkers are stacking skill add ons and then executes with Raging Thunder resulting in the last hit being wasted most of the time in PVE as the pack of monsters would be dead.

The above are just ideas I have to increase the succession class in general as it does need a lift to get to the new generation of characters.

Happy to provide more input and provide more ideas :)