Death's Oath Occultist (3.19) - ~4.8k life/1000 ES. 3-5 Mil. dps
35 Exalt budget~

Would recommend to buy second Life Flask for this purpose
Take Profane Bloom for better clearspeed
Here you can find current UberLab scheme
Best helmet enchant is 'Increased Despair curse effect(30%)'

Flask setup

Greatly increases your dps. Might be expensive at day 1 of the league
If you have 2 wands with +1 to level of chaos skill gems - you may skip this

Life Flask with instant life recovery

You can also craft it :
Take Divine Life Flask and roll next stats by using Alterations
All three stats roll together, it might take 10-20+ alts to roll this
Other Instant apply rolls are also acceptable for first time
(Use Glassblower to add quality to Flasks before crafting / to ones you bought

Quicksilver Flask (movement speed)

There are 2 Movement Speed flasks which are good for us :

Cheap

Expensive

Silver Flask with bleed immune

You can craft it by using Alterations, might take 10-20+
Reduced charges is the best thing you can roll as Prefix

I would not recommend to roll it with alts, better to buy it

Jade Flask with freeze immune

1. Life Sustain
2. Take base jewels as you level up, they should cost 1-2c day1
3. Cluster jewels (remove Unwaveringly Evil from Large cluster filter
On taking small cluster jewel - add Defiance Banner
Also buy an amulet with +1 to level of all chaos spell skill gems
You can craft it by using harvest chaos reforge on any ilvl75+ amulet (5-10 tries)

Make sure to have Cane of Unravelling/2 wands, Tabula
and complete flask setup before going uber lab

You can craft it by using Alterations, might take 10-20+

*Items and colored Text contain promts on hover and links on click

*Items and colored Text contain promts on hover and links on click

Next step is to finally switch to Caustic Arrow/Death Aura. You would need next items :

When you swap from Curse setup into Caustic Arrow - add Blasphemy to apply Despair as aura to make Profane Bloom explode work (you would need mana reservation efficiency explicit on helmet (Eater of worlds)

Vaal Blight (use against bosses)

When you have 6-Link Bow - alt spam until you catch '+2 level of socketed Bow gems. When you have it - use regal orb and bench craft 'Chaos damage over time multiplier' (or damage over time if no multi)

6-Link Imperial bow

Quiver with Damage over time multiplier

6-Socket Death's Oath
( No need to link them)

Change your passive tree as well :

Required stats : 180str/212dxt. Your gear should contain ~50 str in summary
This setup would allow you to farm red maps

When you complete Soul of the Brine King Pantheon you will no longer need Freeze Immune so you take increased Armour/Duration on Granite Flask

If you choose 'The Searing Exarch' in map device - Soul of Abberath is mandatory
because of burning ground from Searing exarch monsters
If you choose 'Eater of Worlds' - you can switch to Soul of Yugul for '30% reduced effect of curses on you' , but i would not recommend going eater of worlds in map device because of a specific mod which makes your projectiles miss, which makes boss fights much harder

Soul of Abberath : Put the Summit Map and Divine Vessel into the Map Device and run the map. Talk to Sin when you kill the boss(Can be found close to act6 Town Waypoint)

Soul of the Brine King : Put the Mineral Pools Map and Divine Vessel into the Map Device and run the map. Talk to Sin when you kill the boss (Can be found close to act6 Town Waypoint)
Repeat with Atoll Map for the next Tier
Repeat with Coral Ruins Map for the next Tier