I thought the Purified buff you got from orb world stayed on until you soaked a blue orb.
But the buff you get, spellID 146022, lasts for 5 seconds only and the describtion says "The process of Purification grants the caster immunity to all damage for a short time.".
This is from looking at logs at warcraftlogs.
What am I missing - is the true benefit from orb world getting adds to do unreduced DPS on?