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Mayhem Berserker benefits from two Stats: Swiftness and Crit. The exact spread is up to one's preference, but most of the players go for one of the following: 

• Crit-focused approach - You wear Crit Accessories everywhere except the Necklace Slot which should be dedicated to Swiftness. Doing this ensures that you deal a lot of damage while remaining fairly mobile. High Crit also helps you compensate for the loss of the +20% Crit Rate from your Burst Mode. 
• A Balanced approach - You spread your stats evenly between Crit and Swiftness. By doing so, you reduce your Cooldowns and increase your mobility, but your overall Crit Chance suffers a bit. 

Berserker thrusts his greatsword down, dealing high amounts of damage. 

This amazing offensive skill offers two very important things: high Damage and high Stagger. Because of this, it's very flexible and helpful during both stagger checks and burst phases. Also, thanks to the Tenacity, it gives you the ability to simply ignore some push-based boss mechanics. 

• Weak Point: Level 2 
• Stagger: High 
• Attack Type: Back Attack 
• Super Armor: Paralysis Immunity, Push Immunity (with Tenacity Tripod)

Level 12

1. [Level I] Tenacity - Grants you Push Immunity whenever you use Finish Strike. 
2. [Level II]  Weak Point Detection - Increases Damage dealt to Push-Immune enemies by up to +70% (at Rank 5). With this, Finish Strike will deal considerably more damage to Bosses (as they tend to be Push-Immune). 
3. [Level III] Lights Out - Changes the Skill to Combo Mode but increases its cooldown by 6 seconds. The second attack deals up to 205% Damage (at Rank 5). With this, you trade skill recharge time for more concentrated damage - worth it. 
4. [RUNE] Galewind - Increases the skill's casting speed. With this, the Skill's animation becomes much faster. This works very well with Finish Strike. 

Berserker thrusts his greatsword into the ground, dealing moderate amounts of damage. Hold the skill for 1.5s to make him attack another 6 times and inflict even more damage. If you hit the Perfect Zone, Berserker will deliver a finishing blow that deals very high amounts of damage and launches enemies in the air. 

This skill is just perfect for a Mayhem Berserker as it has access to the Deadly Blow Tripod that increases its damage massively if the user is at below 50% HP. It's one of your most powerful offensive tools (thanks to the  Leap Tripod)that can also be used as a gap closer/mobility tool if the situation demands it. 

• Stagger: High 
• Attack Type: Back Attack 
• Super Armor: Paralysis Immunity 

Level 12

1. [Level I] Leap - Using Hell Blade now makes you leap over to a target location within up to 10 meters (at Rank 5) range before attacking. 
2. [Level II] Deadly Blow - Increases Outgoing Damage by up to +120% (at Rank 5) if your HP is 50% or below. Your HP will always be at 25% or lower, so this is a no-brainer. 
3. [Level III]  Earth Flip - Element is now [Earth]. After the finishing blow, thrust your sword deeper into the ground, inflicting +120.0% basic skill Damage (at Rank 5). 
4. [RUNE] Galewind - Increases the skill's casting speed. With this, the Skill's animation becomes much faster. 

Berserker charges 4 meters toward the target location and slashes at enemies, dealing moderate amounts of damage and launching them into the air. Use as a combo to make him deliver a spinning attack, dealing 2 powerful hits instead of one before landing a downward blow that deals high amounts of damage. 

This versatile skill deals solid damage and works extremely well during stagger checks. It also offers a solid selection of Tripods that make it hit harder and recharge quicker. 

• Weak Point: Level 1 
• Stagger: Mid 
• Attack Type: Back Attack 
• Super Armor: Paralysis Immunity 

Level 12

1. [Level I]  Quick Preparation - Reduces the skill's Cooldown by up to -8 Seconds (at Rank 5). This can potentially cut 1/3 of the Tempest Slash's base Cooldown, which is massive. 
2. [Level II]  Weak Point Detection - Increases Damage dealt to Push-Immune enemies by up to +70% (at Rank 5). With this, Tempest Slash will deal considerably more damage to Bosses (as they tend to be Push-Immune). 
3. [Level III]  Driving Hit - Removes the 1st attack and makes the aerial spinning attack pain 3 times. Increases outgoing Damage by up to +95% (at Rank 5). 
4. [RUNE] Overwhelm - A rune that makes the Skill deal +30% Stagger Damage (with a Legendary Rune). This will help you help your team with stagger checks. 

Berserker concentrates energy on his greatsword and releases it forward, cleaving the ground. This skill can be charged for 0.8s to deal moderate amounts of damage before being fully charged, and very high amounts of damage when overcharged. 

This offensive skill deals its damage in 4 separate hits that go out in a wave pattern. Depending on the boss's hitbox, you might not be able to land all 4 hits, sadly. With enough practice, you should be able to land at least 3 on any boss. 

• Stagger: Mid-High 
• Super Armor: Paralysis Immunity 

Level 12

1. [Level I]  Wave - Increases the skill's Outgoing Damage by up to +18% (at Rank 5) per Charge Level. This will incentivize you, even more than you already are, to always overcharge this Skill. 
2. [Level II]  Limit Break - Increases the max Charge Level by 1 and reduces the time required to reach Charge Level 2 by 0.1s. The Overcharge Damage is also increased by up to +70% (at Rank 5). This synergizes very well with Wave and promotes overcharging even more. 
3. [Level III]  Earth Flip - Element is now [Earth], The spirit sword flips the ground and travels slowly, attacking up to 4 times and inflicting up to +144% Damage (at Rank 5). 
4. [RUNE] Galewind - Increases the skill's casting speed. With this, the Skill's animation becomes much quicker. 

Berserker swings his greatsword upward, summoning red energy and dealing moderate amounts of damage. On a successful hit, Berserker's attack power is increased by 24% for 6 seconds.

This is your team synergy skill that makes your target take increased damage from everyone. It also increases your own Attack Power massively for 6 seconds. With high Swiftness and a solid Cooldown Gem, you can increase this skill's uptime to ~80%. 

• Attack Type: Back Attack 

Level 12

1. [Level I] Damage Amplification - On Red Energy hit, incoming damage to struck enemies from all party members is increased by 6% for 16 seconds. This is a must-have as everyone needs a team synergy skill, even a Berserker. 
2. [Level II] Vital Point Hit - On Red Energy Hit, your Crit Rate is increased by up to +33% for 6 seconds. This adds another Self-Buff to the skill, which is great. 
3. [Level III] Red Wave - Berserker now swings the greatsword upwards and fires red energy further away, dealing 175% increased Damage (at Rank 5) with 256% increased Attack Range. 
4. [RUNE] Bleed -  This Rune makes Red Dust inflict all enemies hit with a Bleeding effect for 6 seconds. This works well with the skill thanks to its AoE. 

Berserker jumps while spinning counter-clockwise and smashes the ground to create a storm of swords, dealing high amounts of damage and knocking enemies down. 

This skill synergizes very well with Mayhem as its 3rd row Tripod, Flame Storm, increases outgoing damage massively if your HP is at 50% or below. As a result, the Sword Storm deals much more damage than it normally would have. 

• Stagger: Mid-High 
• Attack Type: Back Attack 
• Super Armor: Paralysis Immunity 

Level 12

1. [Level I]  Quick Preparation - Reduces the skill's Cooldown by up to -6 Seconds (at Rank 5). This is a mush-have as you need the cooldown reduction to smooth out your rotation. 
2. [Level II] Increases Damage dealt to Push-Immune enemies by up to +70% (at Rank 5). With this, Sword Storm will deal considerably more damage to Bosses (as they tend to be Push-Immune). 
3. [Level III]  Flame Storm - Element is now [Fire]. On hit, Sword Storm now also Burns the enemy, inflicting Fire Damage every second for 6 seconds. When your HP is 50% or lower, outgoing Damage is increased by 55% (at Rank 1). 
4. [RUNE] Galewind - Increases the skill's casting speed. With this, the Skill's animation becomes much quicker. 

Berserker performs a diagonal upper slash, dealing moderate amounts of damage and launching enemies into the air. 

This is your Counter Skill that also gives you rather potent self-buffs that increase your Crit Rate and Attack Speed for 3 seconds. Thanks to the 3rd row Tripod, Quick Preparation, Chain Sword's buffs have a very high uptime (especially when you run high Swiftness). 

• Attack Type: Back Attack 
• Counter: Yes 

Level 10

1. [Level I]  Vital Point Hit - On hit, increases your Crit Rate by up to +27% (at Rank 5) for 3 seconds. With this, Chain Sword is no longer just a Counter Skill. 
2. [Level II] Swift Attack Prep - On hit, increases your Attack Speed by up to +30% (at Rank 5) for 3 seconds. Same as above. 
3. [Level III] Quick Preparation - Reduces the Skill's Cooldown by 7 seconds at the cost of 39% (at Rank 5) reduced Damage. This tripod is worth it as it massively increases the uptime of self-buffs you get from Chain Sword. 
4. [RUNE] Galewind - Increases the skill's casting speed. With this, the Skill's animation becomes much quicker. 

Berserker charges 7 meters toward the target location and deals low amounts of damage to enemies in the path. 

This is your main mobility skill/gap closer - use it accordingly. With the Excellent Mobility tripod at Rank 5, Shoulder Charge will give you a decent movement range of 11 meters. 

• Attack Type: Back Attack 
• Super Armor: Paralysis Immunity 

Level 4

1. [Level I]  Excellent Mobility - Increases the Charge Distance of the skill by up to +4 meters (at Rank 5). 
2. [RUNE] Quick Recharge - Gives a chance to reduce all Cooldowns on skill use. This is a nice Rune to have on Shoulder Charge because of its relatively short Cooldown. 

Berserker infuses his greatsword with power to create Berserk Fury and deliver a powerful strike. He has to charge up this skill to complete Berserk Fury, and the Damage will become more devastating at higher Charge levels. Attack range also increases according to the charge level. 

This is a truly devastating Awakening that can obliterate pretty much anything that finds itself standing in your way. Just keep in mind that it works the best when fully charged and that fully charging it requires some time. You'll have Push Immunity when charging, so don't worry too much about being interrupted. 

• Weak Point: Level 2
• Stagger: High 
• Super Armor: Push Immunity, Debuff Immunity 

• Chain Sword Gives you Crit Rate and Attack Speed Self-buffs. 
• Chain Sword is also your Counter Skill. 
• Shoulder Charge and Hell Blade can be used as gap closers/mobility tools if needed. 
• Your highest Stagger Damage dealers are Finish Strike and Tempest Slash. Save them if you know that there's a Stagger Check coming. 
• Red Dust is your team synergy Skill. Use it to apply Damage Amplification to your Target and increase its Damage Taken by 6% for 16 seconds. It also gives you a Crit Rate self-buff. 

Your Basic Skill Rotations look as follows: 

1. Standard DPS Rotation: 
   • Use Red Dust 
   • Use Strike Wave or Hell Blade (depending on your Cooldowns) 
   • Use Finish Strike 
   • Use Sword Storm 
2. Stagger Check/Burst Damage Rotation: 
   • Use Red Dust 
   • Use Finish Strike 
   • Use Tempest Slash 
   • Use Sword Storm 

1. Mayhem (Class Engraving) - Your Fury Meter is always maxed out, and you can enter Burst Mode by using the power of Darkness. While in Burst Mode, your Damage is increased by (Level 1: 3%, Level 2: 8%, Level 3: 16%), and your Attack and Move speeds are increased by 15%. When you enter Burst Mode, your HP is reduced to 25% of its total, you receive 40% of healing effects, and shields work on you with 25% of their normal effectiveness, but all incoming damage is reduced by 65%. You can press [X] to leave Burst Mode; Doing so will put it on a 30-second long Cooldown. 

This is the build-defining Engraving. You have to have it. Level 1 is enough at the start as the only scaling bonus it provides is Damage, but you should work on getting it to Level 3 eventually. 

2. Master's Tenacity - When at 50% or lower HP, your Outgoing Damage is increased by (Level 1: 3%, Level 2: 8%, Level 3: 16%). 

This is a natural fit for the build as you'll be at below 50% HP at all times. For a Mayhem Berserker, this Engraving is just free Damage (and you should always capitalize on free damage). 

3. Grudge - Increases your Damage Dealt to Bosses (Level 1: +4%, Level 2: +10%, Level 3: +20%), but makes you take 20% more damage from them. 

This Engraving is extremely powerful, but it will punish you if you make a mistake. It is especially dangerous for a Mayhem Berserker as His effective HP is always relatively low (on the other hand, Grudge's downside is offset by Mayhem's Damage Resistance bonus). Pick it up if you feel like you can avoid most (or all) avoidable damage during boss encounters. If you're still learning mechanics, you'll be better off skipping it. It's only worth using at Level 3, so never use it at level 2 and especially 1 (unless you want to take 5% more damage for every 1% increase in your own DPS). 

4. Raid Captain - Increases Damage Dealt by a percentage (Level 1: +10%, Level 2: +22%, Level 3: +45%) of basic Move Speed Bonus. 

This Engraving is great if you've chosen to go for the balanced stat (50% Swiftness/50% Crit) approach. If you reach 140% Movement Speed, this will give you a whopping 18% increased Damage. 

5. Keen Blunt Weapon - Increases your Crit Damage (Level 1: +10%, Level 2: +25%, Level 3: +50%) but also gives your attacks a chance to deal 20% Reduced Damage. 

The more Crit Rate you have, the more powerful this Engraving becomes. Depending on your chosen stat build, this will have varying effects. Pick it up as your 4th or 5th Engraving if your Crit Rate is high enough to warrant it. 

6. Ambush Master  - Increases the damage you deal with Back Attacks (Level 1 - +5%, Level 2 - +12%, Level 3 - + 25%). You should get this at Level 3 (which could amount to 25% increased DPS if you're perfect at performing back attacks). 

Most of the attacks you will be using have the Back Attack modifier. Because of this, Ambush Master Engraving is an excellent choice. Also, it will encourage you to pay more attention to your positioning as missing Back Attacks while you have it active will make you lose even more potential DPS than otherwise. 

7. Cursed Doll - Increases Attack Power at the cost of reduced 25% Healing Received (does not affect natural Health recovery (Level 1 - +3% Attack Power, Level 2 - 8% Attack Power, Level 3 - +16% Attack Power).

This Engraving can increase your overall DPS rather significantly, but the tradeoff is painful. Only pick it if you are able to avoid most of the incoming damage; If you lack experience, skip it. Also, using this at Levels 1 and 2 is not worth the risks involved (so, use it at Level 3 or don't use it at all). 

8. Increase Mass - Increases your Attack Power by (Level 1: +4%, Level 2: +10%, Level 3: +18%) at the cost of 10% reduced Attack Speed. 

This is a solid choice for the build, but it does not work too well with the Cursed Doll (the separate bonuses do not multiply, unfortunately). 

• Gear Sets - As a DPS Class, Berserker wants His set to boost her offensive capabilities as much as possible. Here are the optimal Sets for each Tier: 
  • Tier 1: Seraphic Oath Set (Epic); Boisterous Elemental Set (Legendary) 
  • Tier 2: Marvelous Earth Set (Epic); Unyielding Will Set (Legendary) 
  • Tier 3: Twisted Dimensional Set (Epic); Preordained Diligence Set (Legendary for a Balanced Crit/Swiftness build); Harsh Oath Set (Legendary for a Crit build) 
  • Mixed Set options for high T3 Gearscores: 
    • Over 1415 GS: 4 pieces of Demon Beast Strength Set (Legendary) + Preordained Diligence Set Glove and Shoulder (Legendary) 
    • Over 1430 GS: Nightmare Flower Set Weapon and Helmet (Relic) + Preordained Diligence Set Glove and Shoulder (Legendary) + Demon Beast Strength Set Chest and Legs (Legendary)
    • Over 1445 GS: Nightmare Flower Set Weapon and Helmet (Relic) + Preordained Diligence Set Chest and Legs (Legendary) + Shrieking Hallucination Set Shoulder and Gloves (Relic) 

• Gems -  With these, you can apply a Cooldown Reduction or Bonus Damage to your Skills. There is a limit of 11 Gems; you should distribute them in the following way: 
  • You should use Cooldown Reduction Gems on the following Skills: Red Dust, Sword Storm, Strike Wave, Hell Blade, Finish Strike, Tempest Slash 
  • You should use Attack Gems on the following Skills: Sword Storm, Strike Wave, Hell Blade, Finish Strike, Tempest Slash 

• Cards - Depending on your budget, you should go for one of the following Card Sets: 
  • Light of Salvation Set - A Full set offers +30% Dark Damage Reduction, changes your Damage type to Holy, and increases your Holy Damage dealt by 15%. 
  • Lostwind Cliff Set - A Full set offers +25% Dark Damage Reduction and +7% Critical Rate. This one is the cheaper of the recommended two. 

ENDNOTE

This is the initial version of our Mayhem Berserker Raiding Build for Lost Ark, where we tried to include all of the important information on how to set up this character while keeping the guide as compact as possible. If we've missed something of importance, please let us know! 

If you have any Build requests, please post them in the Comments section below. We will be happy to cover your most requested builds in the future! Also, we hope that you have found this guide useful and informative. Also, we will be happy to receive constructive criticism that will help us improve our future work, so don't hesitate to give us your feedback.