Deimos Vikings are units available to Han and Horner in Co-op Missions, counting as a Horner unit and available from the Dominion starport. They can be called down anywhere on the map where the player has vision in a group of two. Their AA attack is particularly effective against void structures (such as the Void Thrasher), which are all classed as armored. This allows the Viking to apply full DPS without the upgrade requirement or ramp-up time of the Asteria wraith. While they have less health than Horner's wraiths, the Deimos viking's extra range allows them to avoid being targeted by the void structures' various types of AoE.
They can be upgraded to have attacks that go through targets in assault mode, and extra missile packs that deal 15 damage (+25 vs armored) to targets around the viking. This can be effective on maps with infested.
Attacks from Deimos Vikings in Assault Mode pierce, dealing damage to enemy units behind the target (deals area damage within a length of 7 and a width of 3). Deimos Vikings transform time is reduced by 75%.