Unbridled Rage | D4 Barbarian Key Passive

Unbridled Rage is a Barbarian Key Passive with the following effect (simplified):
Core Skills deal 135% increased damage, but cost 100% more Fury.

Once you select Unbridled Rage as your Key Passive, you can't select any other Barbarian Key Passive. They're considered to be very important parts of your build, so it merits quite a bit of possible discussion.

How best to use Unbridled Rage

Basically this segment will be giving you a rundown on the basics on the "WHEN, HOW, and WHY" of the Unbridled Rage Key Passive.

Questions we would answer here would be like:
How to use Unbridled Rage, as a baseline.
Why you would choose Unbridled Rage over other Key Passives.
When would you consider Unbridled Rage? As a build-around? An "augmentation"?

Unbridled Rage Core Synergies

TBA: When choosing Unbridled Rage, are there "absolute godtier" level synergies you essentially NEED to take?

Related Links & Other Information

Still got a lot to do, a lot of data to track, and how best to present it! Post-launch will clarify alot of this for us!

In the meantime, Related Links:

• If you're here, you're probably looking for some info on the Barbarian Class.
• Related Skill Tree Nodes: Unbridled Rage
• Summary of all D4 Build and Character Customization Systems.