I decided to try to make a build around these Warcry Charms and it ended up being one of my favorite builds i've ever made. I managed to take down 7/7 Uber bosses and most of all doing really well against Maven Invitations, and it also makes for a pretty smooth mapper with Herald of Ash and big AoE.
PoB
https://pobb.in/sLtrSlXAAdNA
Forum Guide
https://www.pathofexile.com/forum/view-thread/3468890
The tricky part about the build is the progression, since you are completely reliant on Charm slots which are unlocked in the endgame, I recommend playing a DD leaguestarter and transitioning into this once you have your charm slots ready. Pretty much any build can get you to atleast 2 charm slots, which is enough to make the build function.
Tripolarbear has a good guide for a DD elementalist league starter that works well. I made a very rough leveling tree and gem setup in my PoB for arma brand into DD as a Necro, but I am no DD expert.
Any way you choose to do it will likely require a decent amount of respeccing so keep in mind this is definately not a leaguestarter.
0:00 Intro
2:03 Leveling
3:58 How I'm Automating Warcries
5:42 Gear
16:45 Gems
21:40 Flasks
23:13 Ascendancies
28:12 Passive Tree
34:11 The Hidden 87% quant
34:50 The Feared 71% quant
36:01 Uber Sirus last phase
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