I hope this is'nt a repost but I found out that if you shadowmeld after a void shift that you are immune for the "damage".
Also a macro that will make it easier
/cast [target=mouseover] void shift
/cast shadowmeld
edit:
Apparantly it was already in the guides section
http://www.ownedcore.com/forums/worl...gnore-dmg.html (Shadowmeld Voidshift Damage (Ignore the dmg))