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Just a simple question, can a tech priest dominus be used as the HQ choice in a combined arms detachment with skitarii and sicarian units? I'm having a hard time finding the specific rules to these things.

While i do not own, those specific books i may suggest, check Cult mechanicus book since i think that's the most complete one about the right rules for an Arms detachment.

I think skitarii lacks HQ choices, but not 100% sure if they are part of cult Mechanicus forces and can be fielded as such.

The answer is Nope.

A combined arms detachment requires all the units to be the same faction or faction-less, so it does not allow mixing of those two factions in it by default.

The only way to mix those two factions within one detachment/formation currently is one of three formations, the war convocation, the war convocation, cohort mechanicus, or the formation from the start collecting box.

You can take for example a Battle Maniple, and a CAD formation of ad mech and have the dominus from the CAD be your warlord unless you are playing with a restriction on how many formations/detachments you can use.

blaktoof wrote:
The answer is Nope.

A combined arms detachment requires all the units to be the same faction or faction-less, so it does not allow mixing of those two factions in it by default.

The only way to mix those two factions within one detachment/formation currently is one of three formations, the war convocation, the war convocation, cohort mechanicus, or the formation from the start collecting box.

You can take for example a Battle Maniple, and a CAD formation of ad mech and have the dominus from the CAD be your warlord unless you are playing with a restriction on how many formations/detachments you can use.

what about incorporating unbound? can the dominus come into the battlefield and be an unbound detachment on his own, as warlord, as the primary detachment? he'd have additional units in formations of their own along in the army.

unbound is meaningless, as soon as one unit is unbound, everything is, so no command boni from any detachment/formation. not sure if you get a warlord trait then either.

 Stephanius wrote:
unbound is meaningless, as soon as one unit is unbound, everything is, so no command boni from any detachment/formation. not sure if you get a warlord trait then either.

You still get formations bonuses in unbound (and warlord traits, you still have one leading your army)

Stephanus is still technically correct: in unbound you get no command bonus, and that does extend to Formations.

It is just that Formations do not get command bonuses, they get Formation bonuses; which are specifically allowed in an unbound army in both the formation rules and the unbound rules in the BRB.

 CrownAxe wrote:

 Stephanius wrote:
unbound is meaningless, as soon as one unit is unbound, everything is, so no command boni from any detachment/formation. not sure if you get a warlord trait then either.

You still get formations bonuses in unbound (and warlord traits, you still have one leading your army)

Right, this is the situation...

My brother has a collection of adeptus mechanicus models, from the skitarii he has 2 units of rangers (troops) and 1 unit of sicarians (elites), while from the cult mechanicus he has 2 units of kataphron destroyers (troops) and a tech priest dominus (HQ/warlord). He's going to be adding a kastelan robot maniple to his army.

the issue we've ran into is he wants to use the formation that has the 2 units of destroyers and a unit of kastelans, where they receive bonuses for using luminagen, but that makes it so he doesn't have the compulsory troops for a combined arms detachment that would allow him to include his dominus.

ALL he cares about with the dominus is just having him as the warlord. If he can have the dominus as warlord, and have formations that still get bonuses, then he'll be happy with that.

As per p116 that's perfectly fine. Formations receive their bonuses even in unbound.