The wiki article only mentions the soft cap of usually 1 military trait.
Let's ask the Devs:
@Trin Tragula @Arheo @Snow Crystal @Jamor @Chopmist Is there a hard cap or limit on character traits in Imperator?
Hm, I've no idea if there is a hard cap from a technical point of view, but I know we've implemented it so you'll never have more than 4-5 traits at max, I believe.
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