If you are playing a matched play game, you are allowed to have an understrength unit in an Auxiliary Support Detachment. Due to constraints within Battlescribe, we are not able to reflect this in the error checking. To properly calculate your PL and Points, add the unit you want to take as an understrength unit and then open the context menu on each model in the unit you do not want to use via right click or tap and hold. Then delete the model from that context menu. This will permanently display an error in your list, but it will calculate your points correctly.
If your army is Battle-forged, all Troops units in ADEPTUS MECHANICUS Detachments gain this ability. Such a unit that is within range of an objective marker (as specified in the mission) controls that objective marker even if there are more enemy models within range of it. If an enemy unit within range of the same objective marker has a similar ability, then the objective marker is controlled by the player who has the most models within range of it as normal.
When an INFANTRY or CAVALRY model in an affected unit is destroyed, roll one D6 before removing that model from play. OPn a 5+, that model can either shoot with one of its ranged weapons as if it were your Shooting phase or make one attack with one of its melee weapons as if it were the Fight phase.
When resolving an Overwatch attack made by a model in an affected unit, a hit roll of 5 or 6 scores a hit.
Improve the invulnerable save of models in affected units by 1 (to a maximum of 4+).
Whe resolving an attack against an affected unit by an enemy model within 9", substract 1 from the hit roll.
Affected units can shoot in a turn in which they Fell Back, but if a unit does so, when resolving an attack made with a ranged weapon by a model in that unit that turn, substract 1 from the hit roll.
Models in affected units do not suffer the penalty for moving and firing Heavy weapons. Increase the Strength characteristic of Heavy weapons models in the affected unit are quipped with by 1.