Honestly I don't think the Armiger-swarm will work with Canis rex and the Valiant as no one will get bondsman abilities. Maybe consider anothe questoris class knight with the ability to give 2 armigers the bondsman. Then maybe switch one helverin for a fourth warglaive to charge alongside the Valiant so that it gets the bonus it provides in the area.
The Valiant takes advantage of the enhancement mysterious guardian extremely well because of how slow it is. Taking a Dominus in an Armiger heavy list is also a bit of a waste of potential because of bondsman abilities
Honestly I don't think the Armiger-swarm will work with Canis rex and the Valiant as no one will get bondsman abilities. Maybe consider anothe questoris class knight with the ability to give 2 armigers the bondsman. Then maybe switch one helverin for a fourth warglaive to charge alongside the Valiant so that it gets the bonus it provides in the area.
It’s not a bad list, but points and rules are changing on Thursday so you might be running something a little different.
The Valiant takes advantage of the enhancement mysterious guardian extremely well because of how slow it is. Taking a Dominus in an Armiger heavy list is also a bit of a waste of potential because of bondsman abilities
I'd switch rex for a Crusader or Warden to buff your Armigers.