For that matter:
Why does the troop card and the dropdown in the troops interface use the kingdom crest (main art) and not the banner? The crest is dense, high-frequency, and as a result it doesn’t scale down well at all on mobile. Even on desktop, where I can scale the whole application up, I can’t for the life of me remember which crest goes with which kingdom. I’ve “solved” that issue by memorizing which troops are in which kingdoms, but that’s surely not the intent.
Using the banner would be much clearer. The banners are simpler, visually distinct, reinforce themselves with the colors inherent to the kingdoms to which they belong, and scale down quite well.
EDIT: I guess that’d be a problem for the banner-less kingdoms (Primal, Apocalypse, Guardians). Oh well? Make some fake banners for those?