archon only lasts 20secs in ros with 120sec cooldown.
+20% cooldown reduction from evocation = (96sec archon cooldown)
+10% cooldown reduction from 50 paragon points(offense) = (84sec archon cooldown)
+30%(?) cooldown reduction from ros weapon = (60sec archon cooldown)
but u still have to wait 40secs for archon even with 50% cooldown reduction.
are there any other ros items with the cooldown reduction? cos u need ~83% cooldown reduction for perma archon.
n im not too keen on using 50 paragon points on 10% cooldown reduction over +10% cc. (10cc = ~69.5k dps on my d3v gear, but np if u have 200 paragon points oc)
same goes for the weapon, xx% cooldown reduction on weapon would be handy but u can probably get identical weapon with ~600int instead. (600int = ~98.0k dps)