God Energy gain has been revamped to actually allow you to have a negative energy gain.
(Eg: A real drain)
If you have 100 Energy Drain, and 95 Energy Gain
Then you will actually go down 5 energy every minute.
If and when you hit 0
Then you will find your persistent bonuses start to turn off.
Levels will decrease every minute or so - until there is enough energy to sustain them.
This puts a greater importance on actual energy, opposed to energy income.
Means that the energy acquired by Followers by killing monsters will be useful now.