Cogbound Alliance
Three separate effects, and the third is the reason to take the detachment. Friendly IMPERIAL KNIGHTS models gain Assisted Targeting (Aura): while a friendly ADEPTUS MECHANICUS unit is within 6 inches of this model, that unit's ranged attacks have +1 Ballistic Skill and [HEAVY]. Friendly TECH-PRIEST models gain Sacristan Pledge: in your Command phase, select one friendly IMPERIAL KNIGHTS model within 3 inches that has not been selected by this ability this phase, and it heals D3 wounds. And Mechanicus Allies: you can include TECH-PRIEST DOMINUS, TECH-PRIEST MANIPULUS, MARSHAL, RANGERS and VANGUARD units in your army, with a combined points value that cannot exceed 500 points. That last clause is a genuine army construction rule printed in full in the pack, and it is one of only two the faction has.