So I've decided since I have everything I nearly care to own for my Ordo Reductor army, I am going to add an allied detachment for my army at the siege of Terra, the basic idea being that after fighting their way to Terra (and regularly retreating to Terra) the army was forced to abandon its heavy vehicles and automata leaving only a handful of infantry. So I decided that they linked up with the white scars and proceeded to help fuck the traitors in the ass. So this is the idea for my army.
Archmagos Reductor (dual power fists, augury scanner, cyber-familiar, rad grenades, three phosphex bombs, machinator array, abeyant): 330 Points
6 Thallax (2 Plasma-Fusils): 275 Points
6 Thallax (2 Plasma-Fusils): 275 Points
6 Thallax (2 Plasma-Fusils): 275 Points
6 Thallax (2 Plasma-Fusils): 275 Points
5 Myrmidon Destructors (Photon Thrusters): 390 Points
>Allied Detachment, White Scars Chogorian Brotherhood
Praetor (Bolt Pistol, Paragon Blade, Digital Lasers, Iron Halo, Bike): 190 Points
9 Outriders (Sergeant, 4 total power axes, Meltabombs): 370 Points
9 Outriders (Sergeant, 4 total power axes, Meltabombs): 370 Points
5 Attack Bikes (Autocannons, Meltabombs): 250 Points
3000 Points
The basic idea is that myrmidons (joined by the archmagos) start on the table joined by some mixture of outriders, attack bikes, and thallax (everything can deepstrike or outflank so I have options). Myrmidons focus on killing heavy infantry with long range photon thruster fire, thallax hunt marines and light vehicles. Attack bikes hunt light vehicles and outriders (one of which is joined by the praetor) finishes off any units that need to be killed. Any bike unit can also assault tanks. I feel like the attack bikes might be redundant with the thallax but I like the additional meltabomb unit, so I may decide to drop them and some miscellaneous wargear (phosphex bombs, iron halo) and see if I can fit in a dedicated command squad and maybe some biker apothecaries.