Ethereal is a competitive map meant to be played in 1v1s and 2v2s. If there are any more players than that, things get hectic. This is, in my opinion, a fun and casual map that you can play if you want to 1v1 a friend.
My Gamertag: Zandril S312
Recommended number of players: 2-4
Gametypes that the map plays on: Slayer, Swat, Infinity Slayer
Link to the map: http://www.halowaypoint.com/en-us/players/zandril%20s312/halo4/fileshare#!/?section=GameMap&SearchDate=7&SortBy=2&view-select=Tile&startIndex=0&details=8a699584-0efe-4726-bd78-cd446d30ed8b
Here are some pictures to give an idea about the map
