This is a Big Team Battle Map that I made on Impact and it works mostly for CTF (You can play slayer as well but the spawning might not be great. If you want to change it to a Slayer map, it shouldn't be very difficult.). There are 2 sniper rifles, 1 shotgun, 1 rocket launcher, 1 concussion rifle, 1 rail gun, 2 warthogs and 2 banshees on the map. The defenders (Red Base) sit up atop a hillside while the attackers (Blue Team) sits in the base at the bottom. Between the two bases there are a few separate and connected Gold structures including Gold Base which has a secret tunnel as well as the Marksman's Ridge and Sniper's Alcove. I was able to utilize almost all of the terrain on the main rock, so gameplay should be interesting. This map should be played with 10-16 players and is created by me, Mackenzie Kelly. 
  
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https://www.youtube.com/watch?v=LNPYAnTgcU0 
  
  
If you like this map, please share it and comment. Enjoy!