>>96359928
WS, SW, AL, WE, NL, BA and EC all benefit from auxilia support.

White Scars canonically often rely on auxilia elements to hold the Territory they take and that works on the tabletop as well, commit fully to fast attack choices and bikes then let the lasrifles sit on objectives for you.

Alpha legion can use their auxilia as human shields to protect their more valuable units which let's you turn lasrifle tericos into ablative wounds for your tanks or dreadnoughts.

Night lords benefit a lot from attacking enemies under status and Auxilia have a lot of options for making status, malcadors in particular can force 4 suppression checks and a pinning check every turn for 190 points.

SW, BA, WE and EC are all powerful melee fighters so they can commit to that identity wholeheartedly and let the aux handle shooting.

UM are also an honourable mention for having the biggest lore connection to auxilia even tho they have few gameplay reasons to take them.