This is a Seven+ year-old, Halo 4 map. Not new. (2013)
but... I did rescue it and you can use it in MCC. Search me (Kenjamin1 MI) in the mcc browser!
Smokey Knight -
Canvas - Forge Island (Underwater Area)
Color Scheme - foggy
Players - up to 16
Gametypes - Slayer, CTF, KotH, Flood and more. Can be fun with Ninja Assassins - *custom slayer variants love this map.
When I find out about a forge trick, I try to find a way to use it. This small, symmetric map was built in the smokey-foggy underwater area of Forge Island. I did attempt to build a race map down there, but changed gears pretty quickly. It is cool to have different atmosphere where you can barely see any distance, but tricky to forge - where you can barely see any distance.
This map has base areas on either side with structure and upper levels, with a spooky forrest swamp in between. (Zoinks Scoob!) I used rocks, trees and green screens in the center area, similar to some flood maps I've seen done. This map is fun with friends as Teams or FFA. Flood and Ninja Assassins work well. Armor Abilities have strange effect, use caution. There is some stray lightsource somewhere, so I placed a Kill Ball out in the sky, like some weird alien moon.
**(Gameplay video, linked below) from Dec.2013
Some of my friends from Halo Diehards captured some gameplay using swords only, have a look, try the map, have Fun! - JAMN
UPDATE: I found the H4 Ninja Assassins gametype, also in my fileshare.
*(my odst looks badA$$ IN BLACK!)