Requirements:
1 Company Command
0-2 Veteran Squads
1-3 Artillery Battery units chosen in any combination from the following list :
Basilisk Battery, Manticore , Deathstrike, Wyvern Battery *
0-1 Hydra Battery
1-3 Enginseers
Restrictions: The Company Command Squad and each of the units of Veterans must either take a Chimera or a Taurox as a Dedicated Transport.
Special Rules:
Artillery Command: The Company Commander from this Formation can issue the ‘Smite at Will!’, ‘Suppressive Fire!’ and ‘Fire on my Target!’ orders to units of vehicles from this Formation. Units of vehicles from this Formation count as having a Leadership characteristic of 8 for the purposes of seeing whether the order has been understood.
Target Sighted: Once per turn, in your Shooting phase, one friendly model equipped with a vox-caster can call in target coordinates. Choose an enemy unit within 18″ and in line of sight of that model and Artillery Battery unit. Until the end of the phase, that battery from this Formation count their weapons as Twin-linked when firing at that enemy unit.
If both Veteran Squads are taken, choose their roll at deployment:
Defenders of Emperor's Might:
Veteran Squads are Grenadiers. They get Preferred Enemy special rule against enemy units within 12" of one Model from this formation and passing any Moral oder Leadership Check as long they are within 6" of one other (none veteran) unit of
this formation.
OR
Forward Observer:
Veteran Squads are Forward Sentries. They got the Scout special rule, but can not out flank. They got Vox Casters for free, but are not allowed to take heavy weapons.
Also they got the following Special Rules:
Broken Arrow:
If the Veteran Squad losing a close combat, by losing all models or being overrun, choose one Artillery Battery unit from this formation. That unit will immediately take an out of sequence shoot attack, with the twin linked special rule against the
veteran squad and its attackers (any models of this units can be target for this attack). Don't roll to wound for veteran models, the squad will removed after resolving the Attack, given their lives for the emperor. The chosen battery can not fire in there next shooting phase.
Protect the Vox Caster:
If the model carrying the vox caster dies, just remove an other model of the squad (even the Sergeant if necessary ) the vox caster have to survive as long as possible.
Source: This Post
*If IA Vol 2nd Ed. is allowed, Ordnance Batteries page 158 and Manticore page 180 can be taken.