Current PoB: https://pobb.in/Bx8mRS604I1g

Core concept was to get a massive amount of "more spell damage" scaling from rage with Ravenous Passion, then gear for cast speed (and crit eventually). Infinite power warcries give some crazy stats:

• enduring = 1500 regen,

• vengeful = 50+ rage/sec & +40 max rage,

• infernal = 40-50% phys as extra fire and fire explodes on kill,

• battlemage = 25% base crit

Eternal Apple auto-trigger loop with 4 sec weapon using FR to savage hit self (enables vengeful and procs enduring composure), then warcries rotate every 3 seconds. due to numbers being numbers you can sometimes get out of sync with the activation window on Vengeful, but you almost always hit the next cycle.

Berserk can be maintained as long as the vengeful buff is active, for the best uptime only run 2 warcries with more duration in the shield. If you pop berserk while vengeful is active you've got ~130% more spell damage. Rage downtime is 4 seconds maximum. With rage mastery warcries grant base 10 rage each every 3 seconds, this ensures that you'll never hit the rage fall off interval and will always be at max rage (40 or 80), assuming you didn't press berserk and are continuously using skills.

It's hard to find the right spell that feels good, reap checks most of the boxes but you need to use rare gloves for conversion. There are several really strong glove options, Soul Ascension being the standout. Those gloves would solve cast speed which frees up gear for crit, lots of experimenting to do.