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H4 Erosion.jpg
Map overview


Halo 4

Map designation:

War Games Map_Set/: 773-9[1]


Lunar pioneer site on Eudemon X49-05


UNSC structures, large cave, swamp

Gameplay overview

Recommended number of players:


Recommended gametype(s):

Sites like this allow researchers the ability to closely observe a world's inner workings prior to colonization.

Erosion is a Halo 4 multiplayer map intended for use as a cave themed Forge canvas. It is one of four such maps to be designed and adapted to Forging.[2]


With hundreds of human colonies now razed in the wake of the Human-Covenant War, the UNSC has dispatched large numbers of advanced pioneer groups to survey potential new worlds. The discovery of Eudemon X49-05 was considered lucky, but concerns remain about the moon’s structural integrity.[3]


Erosion is set in an expansive cave system, including a large watery area inside. Part of the map serves as a Grifball arena. A human facility of unknown function resides here.[2]


  • It is possible to enter the inside of the "Rock Seastack" object on Erosion. This is not possible on other maps.
  • Erosion's pallet has a drastic difference in texture from its fellow Forge Maps. Rather than being a clean white in color, Erosion's objects have a rusted and dirty texture, which is in context with the map.
  • Erosion is often criticized for its uneven and sloped terrain that makes it difficult to Forge on.