Talent Builds
Soul Harvester Single Target
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This build focuses on generating and spending Demonic Cores to feed into Soul Harvesters Hero talents such as Wicked Reaping and Quietus.
Swapping Gloomhound (Mark Of Shatug) for Charhound (Mark Of F'harg), or even swapping both Gloomhound / Charhound + Summon Vilefiend to pick up Doom + Summon Doomguard can be viable variations of this talent build.
Soul Harvester Mythic+/AoE
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This build picks up multiple cleave talents such as Dreadlash, Implosion, Antoran Armaments, To Hell And Back, Doom and Summon Doomguard to create an extremely strong stacked 5 target cleave profile. It scales well beyond this target count as well, but it's the strongest at 5 targets compared to most other classes and specs.
It also changes some of the class talents to take more “useful” Mythic+ nodes like AoE curses, Blight Of Weakness / Curse Of Tongues and Shadowfury. These can always be tweaked around depending on demand.
Diabolist Single Target
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Diabolist Mythic+/AoE
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Class Talents
Midnight brings with it many quality of life changes such as AoE curses via Foul Mouth and supercharged Drain Life with Gorefiend's Avarice, Empowered Drain Life and Soulburn.
There are a few “must have” talents in the Warlock Class Tree.
Burning Rush: Increases your movement speed at the cost of health every second that it's active. This is your bread and butter mobility. Just make sure to not leave it on when standing still if you care about your healers mana.
Damage nodes: Pact Of The Satyr, Pact Of The Annihilan, Pact Of The Eredar and Pact Of The Nathrezim are always taken. They are on the way to useful talents as connecting nodes so don't worry too much about it.
Demonic Circle: Summons a circle for 15 minutes that you can teleport back to once every 30 seconds. Smart positioning and use of this can be a significant damage increase on most encounters.
Mortal Coil: Used for self healing or CC.
Dark Pact: Sacrifice 20% of current health to shield you for 200% of the sacrificed amount. This should be your first line of defensive vs incoming damage. Always press it BEFORE the damage event.
Demonic Gateway: Creates a gateway between two locations your party can use to transport themselves to the other side. This is your raid buff as a Warlock.
Soul Link: 10% damage reduction while your pet lives.
Soulburn: Supercharges one of 4 abilities giving it an extra effect.
Pact Of Gluttony: Healthstones are now Demonic Healthstones and can be used multiple times in combat. This paired with Soulburn (can be macro’d together) is a 1 minute cooldown, 60% max health heal, with a 20% max health buff for 12 seconds. Use this as much as you can!
Spec Talents
The Spec Tree is fairly inflexible with some very low value talents like Fel Armaments and Empowered Felstorm that are never taken with current tuning, and other talents that are very strong like Infernal Rapidity and Imp Gang Boss.
There are a couple of very strong interactions between talents. The most notable being Summon Demonic Tyrant + Reign Of Tyranny, and Implosion / Power Siphon + To Hell And Back.
Summon Demonic Tyrant + Reign Of Tyranny: This combination changes how you play as you want to extend your Dreadstalkers with tyrant, this is something that is done in Diabolist because you have talents that increase pet damage during tyrant (Abyssal Dominion), but not in Soul Harvester since it lowers Demonic Core generation inside your Demonic Tyrant and Apex Talent Window.
Implosion / Power Siphon + To Hell And Back: Pressing Implosion or Power Siphon with To Hell And Back talented summons 1x Imp Gang Boss for every 2 Imps sacrificed that does additional damage and cleaves to 4 extra nearby targets. This talent combination, especially with Implosion, is a big source of sustained AoE and its even worth to press Implosion in single target.
Doom + Summon Doomguard: This is the talent combination that changes how you play the most, using Demonic Core procs to spread Doom and a very powerful Doomguard. Important to note that this talent combination and Implosion + To Hell And Back feeds into a very strong 5 target cleave profile.
Apex Talents
The Apex Talent for Demonology is Dominion Of Argus, significantly buffing Summon Demonic Tyrant.
When you cast Summon Demonic Tyrant it opens a portal for 25 seconds. Hand Of Gul'dan refunds one Soul Shard, every 2nd Hand Of Gul'dan cast to summon a demon that serves you for 14 seconds. All of these demons do both single target and cleave making it a significant chunk of your damage in any scenario. The rotation doesn't change significantly, but it speeds up the rate at which you cast Hand Of Gul'dan with the 1 shard refund.
The long duration of both the portal and the demons summoned in combination with a 1 minute cooldown on Summon Demonic Tyrant means that your damage profile is very extended; 35-40 seconds of high damage and 20-25 seconds of “downtime”.
Hero Talents
Soul Harvester seems to be better performing hero talent at the moment, but Diabolist is not far behind in most situations. If you want to summon more demons and do big burst AoE with Ruination then go for it!
Soul Harvester is more sustained damage and procs via Soul Anathema, Wicked Reaping, Demonic Soul and Manifested Avarice.
Diabolist is more deterministic with a bigger emphasis on your Tyrant window itself via talents like Abyssal Dominion, Infernal Machine and of course the Demonic Rituals themselves.
Soul Harvester
The Core of this hero talent is Demonic Soul and Succulent Soul. As you do your normal rotation you will do a lot of passive damage through Demonic Soul, Wicked Reaping, Soul Anathema and Manifested Avarice.
The capstone talent of Soul Harvester is Shadow Of Death. This changes the way you play slightly as Summon Demonic Tyrant generates 3 shards so you would want to cast it with 2 out of 5 shards to avoid overcapping while going into your Tyrant and Apex Talent window with max shards.
Diabolist
The core of this Hero Talent is Diabolic Ritual. You want to keep track of what demon is being summoned next from your Diabolic Ritual in order to properly plan and react to the bonus effect that it has. This is especially noticeable when you summon a Pit Lord followed by Ruination and Mother of Chaos followed by an Infernal Bolt.
It can be a gain to line these demons up with add spawns or a damage increase, as long as it doesn't cause you to overcap shards. This is especially true for the Pit Lord that does damage on its own and makes your next Hand Of Gul'dan turn into Ruination for a big chunk of AoE Damage.
This hero talent heavily leans into your Summon Demonic Tyrant with Abyssal Dominion and Infernal Machine in combination with the Apex Talents. Defensively Diabolist can choose between Infernal Vitality and Infernal Bulwark.