[BUG/UI Issue] Not always possible to choose caster for overland spells ?
When casting Touch of Darkness (the spell that raises intelligence, but lower constitution), you don't have the choice who is casting. It will be one of your casters that meet the requirements.
However, I once casted 'wither', and a pop-up appeared prompting me to choose the caster.
Also, I didn't find a way to find enchantment active on a unit (You can disable them on the governement screen).