3.1 - Necro BV MoM Uber Lab (Budget to Endgame) The Queen of Blades

Day 1 of ASC
12 hrs into league 1 death Atziri SMOOTH
17 hrs into league EZ Uber Lab (Trials took forever cause not many were mapping)
HH obtained!
Zero Death first Shaper Kill
Zero Death first Shaper Full VOD

This build is designed to be a boss farmer that can complete a lot of boss content with little gear. This build also scales well with gear so the survivability and boss killing speed gets better over time. I was able to successfully complete a max key uber lab as soon as I unlocked in uber lab this league (~17 hours due to waiting to find trials). This build is designed mostly around farming Uber lab; however, would also function great as a boss clearer to complement a fast clearing mapper.

When you think about Uber lab you really have two separate specialties: killing Izaro / Argus with a low chance of failure and moving through the lab as fast as you can. We use two weapon sets to achieve these goals
Killing

Moving
+ Leap Slam-Faster Attacks - Fortify to navigate the lab.

How I landed on this build
3.1 The War for the Atlas and Abyss League brought a lot of substantial changes to the meta and Instant Leech builds were all greatly nerfed by these changes. As someone who had started the last four leagues (Essence / Breach / Legacy / Harbinger) with Vaal Pact Blade Vortex builds, to remarkable success, I was worried. War for the Atlas also completely reset the atlas system and I wasn't confident that I would be able to accurately predict and adapt to the new meta in a profitable way the first week. (The first week of a league is the best time to make money) Because of these factors I wanted a build that I would be comfortable bossing with right off the bat. Atziri is generally always profitable the first week and is a reliable source of character experience. Uber lab likewise is always profitable and with the changes in 3.0 is likely too profitable. Lastly, farming shaper and the other new bosses can be a great option early on. To this end I went and tried out my old Berserker build without Vaal Pact but wanted to try something different.

Links

Pantheon

Bandits

As a Mind over Matter user we want to make sure that we have at least 43% of our max life as unreserved mana. (Supporting math found on wiki)
In order to maximize our survivability without breaking the bank we are going to use Aurumvorax at first. This will give you 40-60% all res (don't break the bank going for 60%) which is a big deal! In order to be resist cap you need 135% in each of the 3 elemental resists, so 405% resists. Since Aurumvorax is going to provide 120-180% of this (~42%) then you're free to buy rares with higher Life/Mana but crappy resists. These items will be SIGNIFICANTLY cheaper than rares with high Life and high resists, let alone ones with Life/Mana and high res.

Stat Priority on Rares
1 - Maximum Life
2 - A single elemental resist (any resist you're not capped on)
3 - Maximum Mana
4 - Chaos resist (we don't need a ton in the lab)
5 - Extra resist

oh by the way you need a good amount of Dex (151/155/159) for level 19/20/21 Blade Vortex.

Please note that only Energy shield bases will have Mana on them. Armour and Evasion are generally worthless for this build, don't bother stacking them on your gear. Until you have pledge of hands you will likely not have enough mana to cover the Life * .43 ratio. IF you are over on mana without Pledge then you're likely low on life.

Side note: Amulet / Ring
You can score a LOT of resists on a single piece here. I would generally start with a medium life, HIGH res ring and amulet. Then eventually move towards an amulet with more damage mods, you can get the following on amulets:
Global Crit Multi / Global Crit / Spell Damage / Cast Speed

You'll likely need gear that has DEX on it in order to level your gems smoothly, although taking nearby +30 DEX nodes is okay. If this is your first character of a league you may need friends / the market in order to obtain gems. Otherwise, if you have completed the gem vendor quest in Act 6 you should purchase the following:
Required Gems

Passives

Ascendancy Order

Fancy Leveling Gear

When you start Uber lab I would recommend at least being level 70 and having a 5L Blade vortex (Level 19). Decoy totem and a spell linked to Culling Strike Support is also EXTREMELY helpful at this phase. Make sure the rest of your gear has life and mana with a bit of resists. Aurumvorax can carry a lot of the resists (especially if you buy a good roll) so you should be able to buy higher life + mana items than normal since the resists will be middling. Generally, before I do my first Uber I'll do a test Atziri run or two to check the damage and survivability.

Once again I cannot state how important Decoy totem is when starting off the lab. With proper decoy totem use, its possible to take barely any damage with Izaro, don’t try to just face tank him. Our first and primary defense layer is that Izaro is busy walking over to decoy while we burn him down.

My gear was roughly:
and a bunch of junk rares.


Flasks


I would highly recommend ignoring Argus and skipping/bypassing extremely rippy Izaro mods (Charges|Conduits|Essences|Gargoyles are generally more dangerous). I would also EXTREMELY recommend hitting as many Darkshrines (that are somewhat reasonably easy to get) since they are always positive now and can give you permanent shrine mods that can make the lab a cakewalk. (e.g. 100% crit, take no damage)

Final Tree
As I farmed Uber lab I slowly upgraded some of my rares until I could drop Aurumvorax and then started using another cheap weapon:

This weapon is underestimated in a big way. For our build, we'll get mana for MoM, spell damage, and Culling Strike on spells. This will free up a slot from dropping Culling Strike Support. Eventually I 5 linked a:

and bought a

and switched to these items. This gave me about 2,000 effective life because of the big bumps in both life and mana. Also, you can drop Spell Echo Support and add Increased Critical Damage since Pledge automatically grants you a Spell Echo(lvl 30) for anything in the staff.

At this point you should be able to comfortably defeat any Uber Izaro combination with a little bit of Decoy Totem tactics. If you want to keep improving your gear, in case you want to go farm harder bosses, you can get better rare items, maybe even a fancy shaper/elder item.
My Final Rares