Here are few neat things I found out. If you die while in ethereal voyage form, you will instantly resurrect at the end of the spells duration. Its not a bug, even has its own message to the effect. Something about "your spirit rejoins your body." Thunderstorm works very well with a level 5 focus in wraith form. If not better that wither. Casting WoD in wraith form also gives you the mana bonus, 400+ damage and you get 15% back as mana! If you can alure it, you can repond slay it.