Overview
Rafa’s Arc Knives may not be the most powerful of his Action Skills in Borderlands 4, yet a smartly designed build transforms them into a potent tool against clusters of foes and ground-based bosses. This configuration centers on using melee strikes to trigger a multitude of damage types—Corrosive, Kinetic, and Incendiary—while offering Rafa means to absorb enemy impacts. Although the build struggles against airborne adversaries, its performance on targets that keep their feet firmly planted is remarkable, making it a favorite for players looking to maximize melee potential combined with smart defensive play.
By emphasizing a balance of damage output and tanking ability, the build enables Rafa to maintain continuous pressure on enemy lines. Every swing with his Arc Knives contributes to a layered system of buffs and regenerative effects that keeps him in the fight even when under heavy enemy focus.
Core Mechanics and Bonuses
At its heart, this build provides a simultaneous increase to both Gun and Melee Damage, allowing Rafa to seamlessly switch between weapon types as needed. Melee strikes progressively build a stacking chance for critical hits, each strike contributing to a cumulative buff that resets upon a critical hit. When these melee critical hits connect, they not only amplify Rafa’s damage output but also return a portion of lost health, reinforcing his ability to withstand enemy fire during extended battles.
Each enemy eliminated with Arc Knives triggers a restoration of Rafa’s health. The restorative effect isn’t limited to a simple health boost: every instance of healing also enhances Corrosive Damage across all attacks and provides a bonus to movement speed. This bonus is cumulative, meaning that a series of successful eliminations can significantly shift Rafa’s combat capabilities, effectively allowing him to operate at peak performance for longer stretches.
When Rafa activates his Action Skill, the harmful effects of Corrosive Damage receive an extra charge. The longer his special ability remains active, the greater the bonus damage becomes—a feature that rewards persistence and aggressive play. This synergy between skill uptime and damage payout encourages a style that consistently pressures enemies, keeping the build in rhythm as extended fights wear on.
Overdrive and Regenerative Effects
Another key element in this build is the integration of Overdrive. While in this heightened state, Rafa not only gains access to increased Corrosive Damage but also reaps generous health regeneration. The strength of this regeneration scales with the remaining duration of Overdrive, turning his temporary surge into a recovery period that sustains him during prolonged skirmishes.
Concurrently, Overdrive benefits Rafa’s shields by advancing the recharge rate and shortening the delay before shields can repopulate. These improvements in defensive mechanics help Rafa absorb damage, which is particularly beneficial when pushing deep into enemy territory. Combined with the defensive boost that comes from receiving less damage while Overdrive is active, the build creates a resilient combatant capable of taking on challenging encounters.
Critical hits during the operation of his Action Skill provide another layer of support: such strikes refresh the duration of his special ability. This mechanic incentivizes players to maintain a rhythm of calculated aggression and careful execution, balancing the need for rapid critical hits against the risk of overextending in battle.
Melee Synergy and STRM Gliders
A distinctive aspect of the Arc Knives build is its connection to the STRM Gliders. Every melee attack with Arc Knives launches these secondary projectiles, which inflict Corrosive Damage based on how many enemies have been marked. This interaction introduces a dynamic that rewards players for managing enemy status; the more foes that carry a marked effect, the higher the damage potential of the gliders becomes.
In addition to their standalone function, these gliders have a restorative benefit. Each enemy defeated while Arc Knives are engaged refreshes the duration of the skill, extending Rafa’s period of enhanced damage and regeneration. This cyclical effect is further amplified once Blade Fury is activated, sending a volley of STRM Gliders in rapid succession to clear groups of enemies with impressive efficiency.
By coupling melee attacks with a mechanism that both damages and resets his skill timer, Rafa’s build consistently pushes enemies back even as it preserves his own operational time in the fight. This interplay of offensive and defensive properties requires precise timing, as each kill and every critical strike contribute to keeping his build active and effective.
Skill Points and Special Interactions
For steady progress, it is recommended that players allocate five skill points into the primary abilities that support this build, setting aside Errant Spark for now. Despite current limits on skill points, this balanced distribution unlocks the most significant benefits from each contributing factor, making Rafa more robust in the field until future updates offer additional investment opportunities.
A particularly interesting set of interactions involves how the Arc Knives are classified by the game. Although they are not projectile weapons by nature, the Arc Knives are considered under the category of indirect projectiles. This classification means that they benefit from various bonuses designed for thrown and non-gun-based projectiles. Specifically, a bonus for Incendiary Damage applies to them, and if the weapon already produces Incendiary Damage, the additional effect is doubled. This subtle category trick means that even skills originally intended for indirect fire can be repurposed to increase the damage output of Arc Knives.
Some abilities, like one that typically provides lifesteal to indirect projectiles, do not affect Arc Knives due to an apparent oversight in the game’s programming. Although this inconsistency may challenge players, it also opens the door for creative adjustments in skill selection and gear that can help mitigate the shortcoming. Overall, this build relies on stacking multiple small advantages to transform a difficult melee skill into an effective and lasting part of Rafa’s arsenal.
Weapon Choice and Supplementary Skills
As an Action Skill build that heavily relies on melee combat, selecting the right secondary weapons is crucial. While Arc Knives dominate in close-quarters engagements, their performance against aerial foes leaves much to be desired. To cover this shortfall, players are encouraged to supplement the build with a weapon that maximizes gun damage. One recommended skill is Vitriol, which temporarily imprints enhanced Corrosive Damage on the next shot after reloading. By using a weapon known for rapid reload times, and investing four points into Vitriol, players can add an extra burst of damage to their ranged attacks, providing a much-needed counterbalance when enemy attacks come from above.
Players can choose between automatic or heavy-hitting options based on personal preference and overall strategy. Those who favor quick, successive shots or single, high-impact rounds should experiment with different armaments to see which combinations pair best with the build’s bonuses. Some excellent choices include weapons outfitted with powerful underbarrel options. Examples of these attachments include Maliwan’s beam-based device, a shrapnel-emitting option from Ripper, or a grenade launcher styled after Jakobs. Each weapon presents its own set of benefits, and the ideal choice depends on how the player intends to balance close-range and long-range combat throughout difficult enemy encounters.
Complementing the main build are several Specialization Skills that boost overall performance. For instance, one skill from the Brute category increases Gun Damage with every instance of gun-based harm dealt, while a skill from the Runner category boosts Gun Damage by 15% when Rafa is in motion. Increasing movement speed further enhances this bonus, and an additional benefit allows shooting on the run without the usual drawbacks. Another skill, hailing from the Daredevil category, shortens the cooldown of Rafa’s Action Skill every time the Repkit is used. Finally, a Sharpshooter ability eliminates aiming penalties even under challenging conditions. Some players might opt for a skill from the Sharpshooter branch that elevates the damage of the first shot following a reload, especially if they favor using precision weapons like a high-damage pistol or a shotgun with rapid reset mechanics.
When it comes to boosting Arc Knives damage even further, one must compare the benefits of certain melee-boosting skills. A particular ability that normally increases Melee Damage based on Gun Damage bonuses does not significantly affect Arc Knives. Instead, a similar ability geared toward Action Skills proves to be more beneficial. Players interested in intensifying their melee damage output should prioritize this alternative, as it directly augments the power of the Arc Knives during active skill phases.
Gear and Equipment Recommendations
Managing equipment and gear settings is crucial to make the most of this build. A shield that relies on armor segments, often referred to as the Onion Shield, is highly recommended. When a shield segment is lost, this gear provides a brief two-second period of complete invulnerability. This grace period can be the difference between sustaining heavy damage and losing the fight during intense confrontations.
In situations where Arc Knives are temporarily unavailable, carrying an AF1000 Repkit — especially one with an Accelerator perk — drastically reduces the cooldown period for retrieving Arc Knives. Similarly, the Firewerks Shield offers a unique method of compensating for the build’s vulnerability to aerial opponents. When shield segments fracture or an enemy is eliminated, this shield triggers rockets that target foes in the vicinity. Although no shield can fully counteract the build’s limitations with airborne threats, these options help create a more well-rounded defensive setup.
Class Items and Firmware Enhancements
The selection of a Class Item plays a significant role in maximizing the build’s potential. A favored option within the community is the Legendary Class Item dubbed The Dancer. This item effectively doubles all Overdrive-related bonuses, which is invaluable since Overdrive acts as a continuous amplifier during the use of Arc Knives. Although not mandatory, the right Class Item can profoundly improve overall combat performance when paired with the appropriate statistics and supplementary skills.
When scanning available Class Items, look for additional benefits such as those provided by abilities like El Catrin, which adds bonus Shock Damage when sliding and boosts critical hit damage tied to Action Skills. Items that grant an extra burst of power on the first shot after a reload can also be beneficial, especially when using weapons known for their quick reloading capabilities. Another useful skill is one that causes enemies to explode and emit Corrosive projectiles upon receiving a mark or critical hit from Action Skills. Such features not only improve damage output but also help control groups of enemies, further contributing to the build’s overall versatility.
Firmware sets also contribute to the build’s strength by providing a range of passive bonuses. A set known as Rubberband Man increases both damage mitigation and lifesteal, making Rafa more resilient during heavy battles. Another recommended set, GOOJFC, improves the damage of Action Skills while also speeding up their cooldowns. For players who face a variety of threats, the Godkiller set offers increased damage output while reducing the impact of heavy-hitting enemies referred to as “Badasses.” Meanwhile, the Deadeye set fine-tunes gun performance, increasing both accuracy and critical hit damage. Although these Firmware sets are not strictly necessary to make the build work, they contribute subtle yet significant boosts that allow Rafa to handle more challenging encounters.
Multiplayer and Release Details
Borderlands 4 offers both solo and cooperative modes, allowing teams of one to four players to test out this build in various scenarios. Cross-platform play is fully supported among all available systems, opening the door for mixed-platform gaming sessions where players using different hardware can come together on a single game session. In addition, local cooperative play makes it possible for friends playing on the same console to tackle missions together.
The game is set to debut on multiple platforms simultaneously. Players using PCs, Xbox Series X|S, PlayStation 5, and even the upcoming Nintendo Switch 2 will be able to experience the game starting from September 12, 2025, with the Switch 2 arriving in the same year as well. Although compatibility with devices such as the Steam Deck remains uncertain, the game’s expansive multiplayer network ensures that teammates can connect regardless of their platform choice.
Bringing It All Together
This highly specialized build thrives on a delicate balance between offensive output and defensive stability. While Arc Knives may have a reputation for being weaker than other Action Skills, their true potential is unlocked through strategic skill point investments, clever use of Overdrive, and the integration of a variety of supportive gear and equipment. As every melee strike contributes to a buildup of critical hit chances and restorative effects, Rafa can sustain prolonged engagements even in the face of overwhelming numbers.
The interplay between STRM Gliders and boosted Corrosive Damage creates a scenario where taking out groups of enemies not only contributes to overall damage but also extends the duration of powerful abilities. This continuous cycle of offense and recovery is supported by carefully chosen weapons and gear that reinforce the build’s weaknesses—in particular, its challenges against airborne enemies. The option to supplement close-quarters combat with additional ranged weapon damage fills this gap effectively.
Skill choices further refine the build’s performance. Investing in abilities that augment both melee and gun damage, along with cooldown reduction skills, creates a seamless combat flow. The decision to allocate points away from some less impactful skills, such as Errant Spark, underscores the importance of fine-tuning the build to adhere closely to the intended strategy. Ultimately, the build demands an active play style in which every enemy kill, successful critical hit, and strategic movement contributes to maintaining the rhythm of damage output and regeneration.
In summary, players who adopt this Arc Knives build for Rafa can expect to engage ground-based foes with significant ferocity while keeping themselves in the fight through a mix of health restoration, shield boosts, and rapid-fire melee strikes. The calculated blend of specialized skills, gear choices such as the Onion Shield and AF1000 Repkit, and the flexibility offered by Class Items like The Dancer makes this build a solid option for those willing to invest time in mastering its intricacies. The inclusion of Firmware sets that boost both damage reduction and offensive output further solidifies its place as a reliable choice for endgame content.
Borderlands 4’s multiplayer framework and cross-platform capabilities only add to the excitement, making it possible for teammates to explore and refine this build in cooperative sessions. Whether tackling difficult missions solo or coordinating attacks with friends, Rafa’s Arc Knives setup promises a unique play style that blends close-range melee power with a carefully balanced defensive strategy. For players who prefer a hybrid approach that values both aggression and survivability, this build offers an engaging alternative that challenges conventional play and rewards precision, timing, and strategic foresight.