It comes down to me be being lazy and not wanting to press as many buttons. Abyssal Echoes is triggers off Voidcleave and frees up a skill slot on my bar for using rebuke if I get caught out of place and need to tank a big hit. Volatile Reversal I think would be more damage over all, but it can feel pretty clunky to use so I don't really like it.
this isn't really a true forge guard build, it's just 'rive void knight' with a different skin, there's not really anything here that's unique for forge guard in terms of your damage output, the weapon is the same used by the void knight version, and all the dmg is coming from ignite stacking with rive/weapon.
You're not a million miles off to be honest, and paladin or VK would likely be an overall better build. The only real difference is the scrap metal node in rive that was recently added. And FG getting the most benefit from it.
