Concept
Just like in the Nephalem Rifts we stack plenty of movement speed buffs together with decent toughness buffs. We do not need Nemesis Bracers here as we can ignore most shrines, just finish the bounties as fast as possible! The added toughness and damage from Mantle of Channeling helps out nicely instead!

Gameplay
The Gameplay here is very similar to Nephalem Rifts. Use Wrath of the Berserker and Ignore Pain to gain crowd control immunity when you teleport from bounty to bounty and trigger clickables! Keep up your buffs and spin around until the bounty is done!

Setups
You can drop Messerschmidt's Reaver and take In-geom to keep Wrath of the Berserker up more constantly if you prefer. Feel free to cube Ambo's Pride and add Bul-Kathos's Solemn Vow as well as Bul-Kathos's Warrior Blood as weapons for insane Fury generation and Movement Speed.

The Whirlwind Rend Barb is one of the strongest builds for solo farming of any kind and shines especially in experience farming as the build can run mid tier Rift levels very effectively due to its somewhat unique mechanic:

Concept
Moving while doing crazy amounts of damage!
You can run around Greater Rift Level 105 and even all the way up to 120 with above 10k Paragons for crazy amounts of experience and loot.

Gameplay
Keep up Band of Might at all times and go from elite to elite. The majority of trash monsters should die on the way as you spin trough. You need to Furious Charge at least once every 5 seconds for the full Focus & Restraint buff and so that Band of Might stays up. The shield provided by Molten Wildebeest's Gizzard should protect your double damage buff from Squirt's Necklace most of the time. Cast Wrath of the Berserker on cooldown and keep up the buffs from Sprint and Ignore Pain to blast around like crazy.

Setups
At high Paragon (around 5,000) you can drop Band of Might, equip Captain Crimson's Thrust & Captain Crimson's Silk Girdle, cube Ring of Royal Grandeur & Lamentation. This version is slightly stronger but a lot more squishy.

Concept
Below under Rend mechanics we talk about how only self casts proc Rend Area Damage. This is exactly what we need do here:

Gameplay
1. Try to find an open map for your first floor where you can comfortably drag elites along with Ancient Spear Rage Flip.
2. Create a huge group of monsters using your Rage Flip, while channeling Whirlwind to stay alive.
3. Once everything is grouped up nicely with a pixel Ground Stomp start doing manual Rends. Focus on your Physical Convention of Elements rotation to deal most damage. Alternate between doing a tick of Whirlwind and casting 2 Rends manually to benefit from Area Damage. Keep the defensives buffs from Mantle of Channeling and Wrath of the Wastes (4) Bonus.
4. Try to stand in Oculus Ring from your follower as often as possible.
5. Drag elite packs along and always fight them with trash around to gain rift progression and utilize Area Damage.
6. Pray for a Conduit Pylon to finish off most elite packs with The Flavor of Time.
7. For the Rift Guardian we use the tremendous power of Bane of the Stricken stacking with our Whirlwind skill. Rift Guardians that summon minions later on like Saxtris and Binder are ideal as we can get additional Rend procs from Bloodbath and nice value from our Area Damage, which is further enhanced by Ruthless for crazy damage output in the final stage.

Setups
At super high Paragon levels (8,000+) you can try the Captain Crimson Trimmings set Setup without Band of Might. Take in Boon of Bul-Kathos instead of Nerves of Steel if you have problem to maintain Wrath of the Berserker.

Here is a Gameplay Video.

Concept & Group Synergy
The  WW Rend Barb as trash killer has awesome AOE possibilities with Rend Bloodbath. This rune together with Lamentation allows you to stack up to 4 Rends on the target (2 normal ones and 2 bloodbath procs). We usually add an Impale Demon Hunter or a Heaven's Fury Crusader because they provide very high single target damage to kill Elites and the Rift Guardian, while providing awesome buffs to the group such as Companion and Marked for Death. Add a zMonk to maintain our buff from Squirt's Necklace as much as possible.

You can basically say a Monk is like a 2nd Rend Barb as you gain double damage from Squirt's Necklace alone, while zMonk still provides massive toughness and damage buffs by himself. zBarb is the other standard support in this kind of speed runs as it provides the full package of toughness, damage buffs and pulling abilities. A zNec is not very useful because Rend, as all other damage over time skills, does not work with any critical hit chance debuffs on enemies. That means Iceblink does not work with DoT skills either, it is just used to buff the Demon Hunter or Crusader Rift Guardian Killer.

Setups
The planner on the right side starts off with the high base damage 2h build using Messerschmidt's Reaver to keep a nice up time on Wrath of the Berserker. In this setup we use Band of Might to gain 5 times our toughness and we want to proc our Focus & Restraint rings with Furious Charge every 5 seconds anyways our up time should be 100%. Bane of the Powerful is used here to gain some more damage to Elites as well as damage reduction from the elites. For our passive skills we take a full offensive approach. Feel free to add a defensive passive like Nerves of Steel or Superstition, if you feel you are dying too much.

On the left planner we switch from a 2h to a dual wield setup. We take Sun Keeper to make use of the higher base average damage as well as the elite damage. We add Ambo's Pride to free up the cube slot for Messerschmidt's Reaver again. As this is the low paragon setup we also stay with Band of Might for 5 times more toughness, but if you are high Paragon (3000+), switch the cube to Convention of Elements for the extra damage.

This build is good for this game mode. This Build uor more information, check out our full Echoing Nightmare Guide and take a look at our Echoing Nightmare Build Tier List and our META post for the best builds and strategies! This build is good for this game mode. This Build utilize the Speed Greater Rift setup with a few tweaks.

Changes

Gameplay

Keep up Band of Might at all times. The majority of trash monsters should die on the way as you spin trough. You need to Furious Charge at least once every 5 seconds for the full Focus & Restraint buff and so that Band of Might stays up. Cast Wrath of the Berserker on cooldown and keep up your Sprint buff to blast around like crazy.