When at a terrain that contains Water (green), Swamp Stalkers may count maneuver results as if they were save results.

During the Species Abilities phase, you may attempt to Mutate providing the following criteria are met:

1. An opposing player must have at least one unit in their Reserves Area.
2. You must have at least one army containing a Swamp Stalker at a terrain.
3. You must have at least one Swamp Stalker unit in your DUA (or a Deadlands minor terrain in play).

Target units in an opponent’s Reserve Area to make a save roll. Units that do not generate a save result are killed. One of your armies at a terrain that contains at least one Swamp Stalker unit can then recruit or promote Swamp Stalker units up to the health-worth that were killed this way.

The number of units that may be targeted in this way is equal to the number of Swamp Stalker units in the Swamp Stalker player’s DUA, up to a maximum of 1 per 24 points of total force size, or part thereof.