The energy cost displayed on the spell cast dialog turns red if the cost exceeds the amount available, but this is always based on the character's main energy pool. It doesn't take into account temporary energy or whether a different energy source such as Dark Energy is selected.
The energy cost displayed on the spell cast dialog turns red if the cost exceeds the amount available, but this is always based on the character's main energy pool. It doesn't take into account temporary energy or whether a different energy source such as Dark Energy is selected.