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This is an amazing neutral gameplay build that can easily be adapted for any content available. The most important parts of this build are its Aspects, Melee ability, and fragments.
As for gameplay loop, use your slide melee to dash forward into enemies and to activate both radiant and devour. With your damage buff activate, use your void weapons to build up super energy. Only use your melee charges to dash forward with the slide melee. This combo is extremely strong as it will also heal you, on top of the above perks. Nova Bomb is a great damage super to use, but if you prefer a different super, make sure the primary weapon type you use matches, so you still gain the benefit of Spirit of Harmony. With Spirit of Inmost, your other abilities will recharge faster after using them, so feel free to spam your abilities as much as you can, as you’ll get them back equally as quickly.
Aspects
Feed the Void defeating enemies with abilities activates Devour. Devour effects are improved, restoring health and grenade energy. Lightning Surge While sliding, activate your charged melee ability to blink forward and call down lightning strikes that jolt nearby enemies.
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 Balance Rapidly defeating enemies with Light damage grants melee energy. Rapidly defeating enemies with Darkness grants grenade energy. 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.

Feed the Void & Lightning Surge

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 Balance
Rapid enemy kills with light grants melee energy. With dark energy grants grenade energy,
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.

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 for the sprint slide attack.
Vortex Grenade
Lingering grenade that deals damage over time.
With a void super, using a void primary weapon, and ideally heavy, to provide more super energy. With this build, you don’t want to hold on to your supers, so the faster you build up that energy, you can cast is and upkeep that damage sustainability. Other notable options are Wavesplitter, which has a high damage output and large enough reserves to sustain constant use. Secondly could be Buried Bloodline, as it can continuously weaken enemies and has a very generous ammo economy,
Recluse is an amazing void weapon to include in any build that has any synergy with void perks.
Ideally pairing this with a void primary weapon in this build synergizes amazingly together. Big ammo capacity and good damage.
One of the best grenade launchers available. Doubling down on the void weapons to maximize damage and energy generation.

Destabilizing Rounds // Demolitionist // Repulsor Brace
Any weapon with the above perks will benefit the build and work with it. Destabilizing Rounds will make enemies nearby to the enemies defeated Volatile. Demolitionist increases grenade ability regeneration for each final blow. Repulsor Brace heals your and applies a void overshield when you defeat enemies affected by any void debuff. This includes suppress, volatile, or any weaken effects.
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Void Siphon/Harmonic Siphon
Either one of these siphons works for the build. Recommend using the less expensive one that is currently available.

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.

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