This page details military structure of
Militarum Tempestus forces including
Detachments and
Formations.
Detachments
Castellans of the Imperium

When the Imperium faces the direst of threats, it requires all of its military arms to work in conjuction to secure the future of Humanity. Bolstered by their versatility and shared devotion to the Emperor, and driven by the desperation such a mustering of strength signifies, disparate Imperial warriors become a force greater than the sum of its parts.
Unlike the
Detachments shown in Warhammer 40,000: The Rules, the Castellans of the Imperium Detachment have
Force Organisation Charts whose slots are a combination of
Battlefield Roles from multiple
Factions. However, they still have compulsory and optional elements, as well as
Restrictions and
Command Benefits, just like any other Detachment. If your
Warlord is part of a Castellans of the Imperium Detachment, that entire Detachment is your
Primary Detachment.
The Castellans of the Imperium Detachment Army List divides the units available into several categories, according to their Battlefield Role. You must use the profiles, points costs, equipment, options, special rules and any
Dedicated Transports available to each unit as described on their datasheet. Each entry will include an abbreviated reference to the codex, publication or dataslate where their appropriate datasheet can be found, denoted as follows:
| HQ
FAST ATTACK
LORDS OF WAR | TROOPS
HEAVY SUPPORT
ELITES |
RESTRICTIONS
This
Detachment must include at least four
Troops choices and two
HQ choices. It may include up to two more HQ choices and any number of additional Troops choices, as well as up to 6
Elites, 6
Fast Attack and 6
Heavy Support choices, and up to 3 Lord of War choices, in any combination. This Detachment must also include units that have at least two different
Factions.
COMMAND BENEFITSFlock to the Front Line: Each time a
Troops unit from this
Detachment is completely destroyed, roll a D6. On a 5+, you can immediately place a new unit into
Ongoing Reserves that is identical, in terms of the original number of models, weapons and upgrades, to the unit that was just destroyed. This new unit counts as being part of the original Detachment, so roll a D6 as described above if they are subsequently destroyed.
Victory points are awarded as normal for new units in this Detachment that have been completely destroyed.
Lord Castellan: If this
Detachment is chosen as your
Primary Detachment, you can choose to re-roll the result on the
Warlord Trait table.
Zealous Defenders: All units in this
Detachment have the
Hatred special rule. However, if this Detachment’s
Force Organisation Chart contains the maximum number of units (excluding
Troops), then all units in the Detachment have the
Zealot special rule instead.
Formations
Airborne Assault Formation
Ground Assault Formation
SPECIAL RULESCalculated Strike: All of the units in this
Formation must either be set up during
deployment or placed in
Reserve - you cannot divide this Formation’s units between the two. When making
Reserve Rolls, make a single roll for the entire Formation, which you can choose to re-roll. On a successful Reserves Roll, all of the units in this Formation
arrive from Reserve.
Mounted Battle Group: All of the
Infantry units in this
Formation begin the game embarked upon their
Taurox Prime transports.
Surgical Deployment: On any turn in which a unit from this
Formation disembarks from a
Taurox Prime, all of its ranged weapons have the
Pinning and
Twin-linked special rules.
Hellrain Brigade

SPECIAL RULESHellrain Reinforcements: A Hellrain Brigade’s
Commissar can call for reinforcements should heavy casualties be suffered. Each time a Hellrain Brigade’s unit of
Militarum Tempestus Scions is completely destroyed, you can - if its Commissar is alive - immediately place a new unit into
Ongoing Reserves that is identical to the unit that was destroyed (in terms of the number of models, weapons and upgrades). Reinforcement units arrive from
Deep Strike Reserve and count as being part of same
Formation.