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This build is one of the easiest to use, and also one of the hardest hitting, boss DPS builds. This build’s setup is purely made to deal as much damage as possible to any boss, but particularly works with the Witness. The setup of this build is to apply a darkness debuff to the boss (in this case it will be slow applied from your melee ability/grenade) then use your super ability. Once used, damage the boss using Still Hunt super ability, in this case, Still Hunt will fire one powerful shot thanks to Celestial Nighthawk. Afterwards, using an Explosive Light rocket launcher, fire off as many shots as you can, using your dodge ability to reload, before returning to Still Hunt. Feel free to use the melee ability during damage, but it’s more selected for it’s ability to apply all the melee activated buffs from Fact of Dawn and Facet of Blessing.
Aspects
Gunpowder Gamble Defeating enemies with abilities, elemental debuff, or Solar damage, will charge an improvised solar grenade. Throwing this grenade does a lot of damage and applies a lot of scorch stacks. Winter’s Shroud Dodging will now slow enemies. Slowing any enemy will increase your class ability regeneration for a short while.
Fragment
Facet of Hope helps with ability uptime, while you have any elemental buff, your class ability regenerates faster. Facet of Protection while surrounded, you are more resistant to incoming damage, while transcendent, the effect is increased. Facet of Courage enemies affect by any darkness type element debuff, will take more damage from any Light ability. This includes your super. Ideally, apply your duskfield grenade to the boss before using your super. Facet of Dawn Powered melee hits against enemies makes you radiant. Powered final blows makes you and allies radiant. Facet of Blessing Melee final blows start health regeneration. While transcendent, melee final blows start health regeneration for you and nearby allies. Facet of Purpose Picking up an Orb of Power will grant an elemental buff, based on your super element. In this case, you will gain Restoration.

Gunpowder Gamble & Winter’s Shroud

Facet of Hope
While you have an elemental buff, class ability regens faster.
Facet of Protection
While surrounded, you are more resistant to damage. Effect is increased while transcendent.
Facet of Courage
Your Light abilities deal increase damage to enemies afflicted by Darkness effects.
Facet of Dawn
Powered melee hits makes you radiant. Powered melee final blows makes you and allies radiant.
Facet of Blessing
Melee final blows start health regeneration. While transcendent, the effect is applied to allies.
Facet of Purpose
Picking up an Orb of Power will grant an elemental effect based on your equipped Super.

Marksman Dodge
Dodge away and instantly reload your weapon.
Triple Jump
Best overall movement jump for the Hunter.
Withering Blade
2 charge melee ability, useful to gaining melee buff benefits at a distance
Duskfield Grenade
Lingering grenade that deals damage and freezes overtime.
The best weapon to use with the alternating attacks with your rocket launcher. Activate Cayde’s Retribution and unload the magazine. Keep using this weapon until your rocket is reloaded (Reconstruction or Auto-Loading) or, if you do not have that, until your class ability is recharged. This weapons interaction with Celestial Nighthawk makes it the best weapon to use in this build.
A great strand hand cannon to use as your primary weapon in this build. It has great perk options to be selected from.
If you’re looking for a more ranged option, any pulse rifle will work. I like the 2 burst option for high damage in shorter amount of time that Aisha’s offers.
One of the best rocket launchers available. Ideally use a Solar rocket launcher in order to match the element type so your Surge mods apply.

Reconstruction // Auto-Loading
Main perks that matter on your Rocket Launcher. This enables a smooth transition between weapon swapping for damage and has less down time needing to reload, and is instead replaced with more damage. Explosive payload or any extra damage perks for the primary weapon will also help as it will be your only weapon damage source outside of boss damage.
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Strand Siphon
Recommend using the Siphon that matches your primary weapon type.

Hands-On
Generate super energy on Melee kills.

Heavy Ammo Finder
Increase the drop-rate of heavy ammo.

Heavy Handed
Melee final blows create Orbs of Power

Impact Induction
Causing damage with your Melee attack will reduce your grenade cooldown

Element Resistance
Use the appropriate element resistance that corresponds with the activity you are doing.

Solar Weapon Surge
While having active armor charges, your Solar weapon damage is increased.

Innervation
Reduce grenade cooldown with each Orb of Power pickup

Absolution (opt)
Reduce all ability cooldowns with each Orb of Power pickup.

Time Dilation
You can retain armor charges for a longer period of time

Bomber
Reduce your grenade cooldown when you use your class ability