I making a Dreamer stricktly focus on light damage. And now its time
for weapon. I thinking about Cresent Moon, is it best to make in Phase Blade or should i go with berserker axe for higher phys damage.
Can i reach the next highest speed (5 fps / s) with zerker axe or should i go with phase.
You need 72% total IAS to hit 4fpa using a phase blade. You need 63% total IAS to hit 5fpa with a berserker. You can get these numbers using this calculator. Just select the proper weapons/skills and click "Show IAS/FPA Table".
Crescent Moon is a good weapon: the -35% res allows you to deal with broken immune monsters a bit more efficiently and the Static Field is incredibly awesome. But from my experience, Grief is a superior (if not particularly creative) choice for a Dreamer. The massive physical damage will tear LIs to ribbons, while your Shock deals with everything else. I've found that I 1-2 hit almost every monster in Hell mode using this setup, and it's fully capable of hunting down ubers.