Ethereal - Insubstantial like Mist.
Ethereally - Doing something in a Ethereal manner.
My Youtube
TD 50 TS 50 TSW 50
Posted by: carls murder
that or you can play the 7 on 7 playlist thats up every day.
Yes: It's up permanently.
No: Playing it everyday will not get you the achievement, it MUST be on the 7th of the month.