Currently, the tooltip in a tactical battle, when hovering over an enemy unit, only shows the damage range and to-hit % of a regular attack with the unit's currently equipped weapon. 

What I'm proposing is that the tooltip should change based on the currently selected action, with all possible modifiers and effects involved. 

For instance, if you have a heal spell selected, you should see the range of healing, including a break down of all modifiers (shard bonuses, trait bonuses, etc,) for the unit the cursor is hovering over. 

For a damage spell or debuff on an enemy unit, besides modified damage (taking into account the potential target's appropriate elemental resistance to that spell, if any), it should also show the % fail chance based on your spell mastery vs their spell resistance.

This should work for abilities activated by traits (ie crushing blow) and items (ie throwing knives) as well.