Arcani can hide almost anywhere and are strong melee fighters. However I have a hard time using their abilities in a meaninful way.
The only decent tactic I have come up with is to hide them a short distance from one of my flanks. Then hammer into the main melee and hopefully start a rout. Hiding them far out has never worked for me because enemies either won't come close, or will come close in too great numbers for the arcani to handle. I've used them in city sieges where 1 on 1 battles are common, but arcani are less good for this than regular heavy infantry.
I suppose you could lure the enemy into a nice ambush, but it never happens in my campaigns. By the time arcani are available most of the action consists of me sending heavy stacks to besiege cities. So I stick to recruiting Legionary Cohorts/Plumbatarii instead.
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