Our Borderlands 3 FL4K Leveling Build Guide features a complete step-by-step leveling guide, mainly focusing on your output of critical damage and aggro relief while keeping the early progression exciting and powerful. By the end of this build, you'll be using the action skill Fade Away in conjunction with many of the skills that amplify critical damage.
Fl4k is a very viable option for solo play! With a selection from three trustworthy companions (Skag, Jabber, Spiderant), a constant pet by your side will lessen the aggro from large groups of enemies, taking most of the pressure off of you.
FL4K Full Build
Although this build heavily leans on offensive skills, few of Fl4k's skills in this build compensate for the lack of survival with tons of HP regeneration and aggro relief. When facing a troubling enemy, just use Fade Away and hold down the trigger. After using your action skill, you'll be able to regain it in no time with cooldown reduction skills.
The following is the full build you will end up with, but it isn't how you should level it up initially. We've got a step-by-step guide below that features what skills you should have as you level your character!
FL4K Leveling Build Guide
Hunter Tree - Levels 2 - 7
At level 2, you'll be able to use your action skill and pet. I advise Spiderant Centurion for a durable companion and also gives you a constant 1% HP regeneration. You can also issue an attack command for your Spiderant to charge at enemies. Keep in mind that it has a short cooldown. For the action skill, stick to Gamma Burst for AoE (area of effect) and pet buffs.
After reaching level 3, go to the Hunter (orange) tree on the first tier and add 2 skill points to Interplanetary Stalker and 3 skill points into Leave No Trace. This gives you multiple bonuses for one skill. Additionally, it stacks to gain increased bonuses depending on the type of enemies you kill. For Leave No Trace, you will be able to add free ammo in the chamber for simply attacking an enemy's critical spot, allowing you to shoot further before reloading (Second Intention gives slightly faster reloading, but is somewhat redundant to the future of this build as you'll keep regenerating ammo!).
Hunter Tree - Levels 8 - 12
In the 2nd tier, you've unlocked an augment for the action skill Rakk Attack! which you should switch Gamma Burst out with. Apply Rakk Open a Cold One to convert the action skill's base fire damage into cryo, potentially freezing enemies, allowing easier critical shots. Spend 2 skill points into Head Count for the possibility of reducing your action skill cooldown upon dealing critical damage. Next, finish up Interplanetary Stalker by maximizing 5 points into it.
Hunter Tree - Levels 13 - 17
For 3rd tier, spend 5 points into Two F4ng for up to 25% chance to shoot a free extra projectile from your weapon. You've unlocked the second augment, Falconer's Feast which returns a portion of your health from damaging enemies with Rakk Attack! Be sure to add this as your second action skill augment. Also you have a new pet evolution, Spiderant Scorcher, giving you 10% bonus elemental damage and your pet the ability to burn nearby enemies. Swap out the Spiderant Centurion for it!
Hunter Tree - Levels 18 - 22
For the 4th tier, spend 3 points into The Most Dangerous Game for solid bonuses upon killing a badass enemy, also it adds extra cash rewards too. Spend 2 points into its neighboring skill, Big Game for the Hunter skill bonuses. Replace Rakk Open a Cold One with the new augment Flock'n Load to send in 2 additional Rakks, totaling to 4 Rakks at once! Also you have a new pet evolution, Spiderant Countess, but Scorcher is more beneficial with its AoE aura.
Hunter Tree - Levels 23 - 28
For 5th tier, replace the augment Falconer's Feast with Rakkcelerate for an extra charge and 20% cooldown rate. Spend 1 point into Galactic Shadow, giving you 15% more critical damage and less aggro from enemies. Next spend 1 more point into Big Game, then 3 points into Hunter's Eye.
You have finally reached the capstone for this tree! Megavore is much more powerful than it seems. Megavore can crit with rocket launchers, grenade launchers, flamethrowers, atlas and torgue weapons where as opposed to without Megavore, you cannot. Also, You will be able to crit enemies without critical spots or very small/hard to hit critical spots. Lastly, this capstone synergizes very well with Head Count and Leave no Trace, giving you much more ammo regeneration and cooldown reduction.
Stalker Tree - Levels 29 - 33
It's time to switch over to the Stalker (green) tree. For the 1st tier, maximize 5 points into Furious Attack, giving stacking bonuses to damage and handling when shooting an enemy. Keep in mind you should keep Rakk Attack! equipped.
Stalker Tree - Levels 34 - 38
For 2nd tier, spend 2 points into Eager to Impress for further cooldown reduction upon each kill. Spend 4 points into Overclocked for higher fire rate (with Two F4ng, your RPM should be through the roof!).
Borderlands 3 Leveling Guides Coverage
Stalker Tree - Levels 39 - 43
For 3rd tier, you should equip Fade Away including the two augments: Guerrillas in the Mist (removes the maximum shots during action skill) and Not My Circus (focuses all aggro on pet). Put 1 point into Lick the Wounds for the ability to be revived by your pet. Spend 3 points into Turn Tail and Run for improving survival while on the move and damage while holding position.
Stalker Tree - Levels 44 - 50
For 4th tier, spend 3 points into The Fast and the Furryous for solid gun damage and movement speed. Next, put 2 points into Eager to Impress.
For 5th tier, you've unlocked the boss slayer augment Unblinking Eye that replaces Not My Circus. This augment potentially gives you 225% extra critical damage, including 50% critical damage from Guerrillas in the Mist. Combine this with your insane RPM and other critical bonuses. For the last 2 points, Rage and Recover gives a great value for the amount of HP regeneration.