As utility based abilities have become the next focus in kytharos, we've been thinking about the systems that should work around utilities. A system we came up with is the mana reserve system. Whenever a utility based ability is casted, if that ability required sustainable time then it will require a certain amount of mana to be reserved for the upkeep of that ability. This means that your overall mana will be limited for the duration the spell is active.
To see how much mana is being reserved while a spell is active, it will be visible as a different colour on the mana bar. We're also thinking if we should display the numerical value on there also, maybe this could be configurable through settings.