This build is a good boss damage setup. While it did receive a severe nerf in season 21, it can still be used to do decent damage. The build relies on throwing as many grenades as possible while standing in Well of Radiance or Empowering Rift. While standing in these, and dealing damage, will regenerate your grenade energy. Using Fusion Grenades will give you 2 grenade charges to use.
Touch of Flame is a big increase in our grenade damage. In this case, Fusion grenades explode twice. This effectively doubles the damage of all your fusion grenades that you use in this build. The second aspect can be selected up to personal preference. In this case, I prefer Heat Rises, as it allows you to shoot your weapons while gliding. Consuming the grenade will allow you to float for much longer, and you gain increase directional control. This is really helpful for any jump puzzles in raids that you may encounter.
Ember of Searing will create Firesprites when killing any scorched enemy. It does have a short cooldown between activations. Firesprites provide grenade energy when collected. Ember of Ashes allow you to apply more scorch stacks when you scorch enemies. When enemies get scorched enough, they ignite and explode. Ember of Torches make you radiant when you hit enemies with your powered melee attack. Radiant increases your damage and the damage of anyone near you. Ember of Mercy will apply restoration to you and other when you revive allies. More importantly, you also gain restoration when you collect Firesprites.
Touch of Flame & Heat Rises
Ember of Searing
Defeating scorched targets creates Firesprites
Ember of Ashes
Increase the amount of scorch stacks you apply
Ember of Torches
Apply the radiant buff on successful melee attacks
Ember of Mercy
Gain restoration when collecting Firesprites
Standing in the rift increases you and your allies damage.
Best overall movement jump for the Warlock.
Ranged scorching melee attack. Helps apply radiant.
Best grenade for this build. Explodes twice.
Witherhoard is the single-most recommend exotic weapon for this build. Since Starfire Protocol relies on doing damage to regain your grenade, Witherhoard is the perfect fit. It applies damage over time that lasts quite while. Not only providing grenade regeneration, but also allowing you to use different weapons for damage.
The Calus Mini-Tool SMG can roll with Incandescant which is very strong with any scorching build. Highly recommended in this build.
This is a great rapid-fire fusion rifle that can output great damage. With the Vorpal weapon perk, it is great for bosses.
Cataclysmic is amazing for boss damage. It is particularly powerful for any distant DPS requirement.
Incandescant or Demolitionist
Any weapon with Incandescant is ideal for this build. Because Incandescant will Scorch targets for each final blow. The more scorch stacks on enemies the better since it helps with solar ignitions as well. You could also get away with Demolitionist, it won’t synergize quite as well with this build, but it will help you keep your grenade energy charged.
Solar Siphon/Harmonic Siphon
Either one of these siphons works for the build. Recommend using the less expensive one that is currently available.
Ashes to Assets
Generate super energy on grenade kills.
Font of Wisdom (opt)
Increase Intellect for a short while.
Grenade kills create Orbs of Power
Bolstering Detonation (opt)
Generate class ability energy when dealing grenade damage.
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.
Reduce grenade cooldown with each Orb of Power pickup
Reduce all ability cooldowns with each Orb of Power pickup.
You can retain armor charges for a longer period of time
Reduce your grenade cooldown when you use your class ability