Friendly IMPERIAL KNIGHTS models have the following ability:
Assisted Targeting (Aura): While a friendly Adeptus Mechanicus unit is within 6" of this model, that Adeptus Mechanicus unit’s ranged attacks have:
+1 BS. . Friendly Tech-Priest models have the following ability:
Sacristan Pledge: In your Command phase, you can select one friendly IMPERIAL KNIGHTS model within 3" of this model that has not been selected by this ability this phase. If you do, that model heals D3 wounds.
Mechanicus Allies: You can include Tech-Priest Dominus/Tech-Priest Manipulus/Marshal/Rangers/Vanguard units in your army (see Codex: Adeptus Mechanicus). The combined points value of such units cannot exceed 500 points.