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A small UI thing that would be quite useful : in the Army setup screens, after/below the scripta area, add a "Req'd Gem" number per gem type.
It would indicate the total basic gem cost of the scripted spells according to the mage's paths (basic, that is without any buff effects that could occur with the scripted spells, only counting base gem cost of spell and necessary additional gems if the mage is under the required level).

Any figure obtained that is more than the current number of gems carried by the mage should be tagged in red or whatever so the player is warned the guy needs more gems.