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A great build made for clearing groups of enemies effectively, without sacrificing a lot of damage. Ideally using Osteo Striga or Thorn for the interactions with Necrotics, you can very easily spread poison to all enemies, clearing packs of them with great efficiency. This is because of an interaction that allows Spirit of Necrotics, or the actual exotic Necrotic Grips, to activate on enemy kills while using Osteo Striga or Thorn. Being able to spread that poison effect from a distance, 100% of the time with your primary weapon is insanely powerful for controlling enemy density. It doesn’t do too much against bosses, but thanks for Spirit of Star-Eater, our supers will do much more damage to compensate, and you’ll still have your heavy weapon fully available.
Aspects
Feed the Void defeating enemies with abilities activates Devour. Devour effects are improved, restoring health and grenade energy. Helion is a Solar wisp that is summoned by using your class ability. The Solar wisp will launch solar mortal projectiles that will scorch enemies.
Fragment
Facet of Grace will generate more transcendence energy when defeating enemies with Kinetic weapons. This is particularly helpful since we’re using Osteo Striga or Thorn. Facet of Protection while surrounded, you are more resistant to incoming damage, while transcendent, the effect is increased. Facet of Blessing Melee final blows start health regeneration. While transcendence it will start health regeneration for your allies. Facet of Dawn Powered melee hits against enemies makes you radiant. Powered final blows makes you and allies radiant. Facet of Dominance void grenades will now weaken targets. Particularly helpful for bosses right before using your super or heavy weapon.

Feed the Void & Helion

Facet of Grace
Defeating enemies with Kinetic weapons grants bonus transcendence energy,
Facet of Protection
While surrounded, you are more resistant to damage. Effect is increased while transcendent.
Facet of Blessing
Melee final blows start health regeneration. While transcendent, the effect is applied to allies.
Facet of Dawn
Powered melee hits makes you radiant. Powered melee final blows makes you and allies radiant.
Facet of Dominance
Void grenades now weaken enemies.

Phoenix Dive
Dive to the ground and generate a burst of healing for you and allies.
Burst Glide
Best overall movement jump for the Warlock.
Arcane Needle
3 charge melee ability, used to start health regeneration
Vortex Grenade
Lingering grenade that deals damage over time.
Osteo Striga or Thorn are the main exotics for this build, since they are the only weapons (so far) that interact with Necrotic Grips Exotic perk. These are both Kinetic weapons that will help general Transcendence energy effectively, and spread poison quickly to all enemies. There are some raid boss encounters where you will want to use an exotic heavy weapon, if you do, use a kinetic primary weapon to keep your transcendence energy up.
A strong energy weapon that can quickly be pulled out to deal with tough enemies or added boss damage.
A very versatile weapon to quickly spread scorch to enemies and deal great damage to tough enemies. It won’t deal great damage against bosses, but can pair very nicely with Osteo Striga or Thorn.
One of the best grenade launchers available. Can output great damage. Use Apex Predator if you prefer to use a rocket launcher.

Incandescant // Voltshot
Both these perks on this build will help deal with enemies. Since this build uses a Kinetic weapon primarily, as its Exotic as well, there are not many perks to choose from. These perks will help deal with crowds of enemies easily.
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Kinetic Siphon
This build’s main weapon is Kinetic, so using a Kinetic siphon makes the most sense.

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.

Void Weapon Surge
While having active armor charges, your Void weapon damage is increased. (Match this to your used Heavy weapon)

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