Based on what i read in some guides,
1. gear up all the spirit item u have.
2. when PVE and b4 u get shadow form, use this ->
cast mind blast,turn around and start running, while running cast SW:Pain and cast VE(this 2 spells no need u 2 stop to cast them), turn around and MindFlay mob,when the mob near u and start to hit u,shield urself and wand the mob to death...ur will never stop for mana rest if u follow this steps based on my exp.