Are Demons of heavenly rivers/fires banishable (as demons)? They lack the demon icon. Or are they not really demons?
Do you think it would be possible to add icons for "emits X", such as "emits noxious fumes" (hydras, bog beasts, etc.) or "spreads disease cloud (or whatever)" (Old Guy With Iron Crutch)?
Small gem icons above the gem-box to show the minimal gem cost of the currently scripted spells [counting both gems that form part of spell costs, and the minimum needed gems to cast the spells if the current magic paths are not sufficient]... Ok, that is strictly speaking not an ability/icon.
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When I said Death before Dishonour, I meant alphabetically.