I'm assuming this is a 'not yet implemented' feature, but just in case - the tooltips throughout the game are excellent, with one significant failure - the spell tooltips, both in the spellbook and (especially) in battle don't show the actual damage output from a) amount of proper shards you control and any skills/equipment that modifies damage output.

At a glance, Firebolt is terrible, but with my mage hero, it actually hits extremely hard. This info should be displayed in all relevant locations.

They could also use range/area of effect/etc stats in the tooltip - while gaming nerds may intuit burning hands to be a range 1 spell, or 'grasp of shadow' or whatever, that info needs to be on the tooltip.