Upheaval and Onslaught use

[Felorr]

In short I found it necessary to use onslaught 2-3 times between zerk windows because it is oGCD, making it easier to regain the perfect amount of BG just in time for your zerk windows. Fellcleave is a GCD and 50 BG, which will set you back even further in BG for your upcoming zerk window.

This. Onslaught's cd of 15 seconds allows you to generate 50 to 60 gauge within that time. Meaning, if zerk comes up in 20ish seconds, and you're already at 50 to 60 gauge, you better onslaught right now to ensure you can use it again to dump that last little bit of gauge before your zerk phase. There's no worse feeling than being capped on gauge, having nothing but FC to spend it on, and having your zerk coming up within a few globals.

[SyzzleSpark]

A WAR that makes clever use of Onslaught is a sight to behold, honestly. Not a mechanic on the planet will keep them off the boss longer than it has to. Ask any melee DPS, the difference between a great parse and a fucking awesome parse is uptime. Tell me Mr. Anderson... What good is a Fell Cleave if you're not in melee range...