3-Player Push META

Trash Killer
Nova Necro, Natalya DH, Meteor Wiz, Scythe Necro

This position usually requires a build with good Area of Effect (AoE) damage like Death Nova or Meteor and huge temporary buffs like Arcane Attunement, Spellsteal, Assimilation etc. The main task is executing the damage rotation properly in order to progress through the Rift. With a double-support setup, the build must also be powerful enough to finish off the Rift Guardian by equipping Bane of the Stricken.

Main Support
zBarb, zDH, zMonk

The main Support role requires good pull abilities, good overall damage & toughness boost. The main task here is to pull monsters together (for Area Damage value) for the Trash Killer, drag Elite packs along, scout the map and keep up damage & toughness buffs.

Secondary Support
zDH, zMonk, zNec

The second Support usually provides even more toughness and damage buffs to the group. The main task here is often very simple: Keep up all buffs while sticking close to the damage dealer. Sometimes the second Support also helps to scout the map and engage enemies.

or Rift Guardian Killer
Rathma Necro, Spider WD, Impale DH, Invoker Sader

The RGK requires a build that revolves around high single-target damage, often combined with fast attack speed skills to stack Bane of the Stricken.

Concept
With two supports, this plays very similar to a 4-player group with the exception that the boss kill is slower, so you should use a build that can both clear the rift well and finish off the RG. LoD Death Nova is the best build for the job despite it being pretty bad against Rift Guardians.

Death Nova Necromancer exels at decimating large packs of monsters thanks to density scaling of Bloodtide Blade. Simply wait for all the buffs and CC to be set up and spam some Death Nova into it. This uncomplicated strategy is nearly guaranteed to blow any enemy to smithereens.

Of course, this build kinda falls apart when facing just one enemy so precautions must be made. Luckily we can make sure that there's always more than one enemy to fight thanks to Nemesis Bracers. Save every pylon except Conduit for the boss fight. After waiting some time to stack Bane of the Stricken, the zBarb should go and click all the pylons and bring the elites to the boss. Bonus points if they have the Illusionist affix!

The Trash Killers are supported by a zBarb pulling Elites and grouping monsters together with Ground Stomp Wrenching Smash. On top of that, the Barb provides massive toughness buffs with Ignore Pain Mob Rule and War Cry. Additional offensive and defensive buffs are provided by the zDH.

Concept
Similar to the above setup, a support Barbarian (or Demon Hunter) pulls enemies together for massive Area Damage value but we drop other valuable buffs from the missing support. This is generally harder to play but necessary for builds that have low boss damage such as Grim Scythe.

Technically this setup can be played with any combination of the top tier Trash Killer and Boss Killer builds, but the top choices in Season 33 are always gonna be Necromancers.

LoD Death Nova is the top pick for the trash killer role. Just like in 4-man there's little reason to choose another build for this role. Rathma AotD is also the sole contender for the top RGK role with all competition lagging significantly behind.

As far as supports go you actually have a choice to make. The default option is keeping the zBarb who gives you much better grouping and defensive bonuses but little in terms of damage buffs. In comparison zDH provides a lot more damage but less defense and they need to use Natalya's Vengeance setup to do pixel pulls which can do the job fairly well but can be very difficult to execute depending on the mobtype. And, of course, without Rage Flip your pulls are never gonna be as big.