Misinfo

It should state that exhastion only affects the maximum mana you can use at one time not your actuall max. i.e. you can have 50 mana on an ele but not be able to use it since your exhastion puts you at 0. It could also be stated that it hides what your mana total is if its above the exhastion point. Sorry but I'd vote for this description being more confusing than the existing one. You used the incorrect term mana, and from reading your post a few times, I still don't know exactly what you mean.
I think you mean that your energy can be 50 out of 0 (50/0)?
I haven't used exhaustion much, so I don't know how it works in a case like that though, but assuming tha'ts how it works, it would be good to mention that I suppose.

While we're on the topic... can't necro self-inflict (negative) conditions on themselves, such as bleeding, from using certain skills as well?

I also have a question: When Exhausions stack, the regeneration stacks as well, correct? I believe that's what I heard. Therefore saying that it takes longer to recover isn't entirely true...

One way to test if energy can be truely 40/20, in case it hasn't been done: due to the fact that exhaustion decays at 1 pip and ele's typically have 4 pips of ER, one would have to make the exhaustion decay larger than the energy regeneration. This would mean stacking many exhaustions and/or reducing the energy regeneration (preferrably by maintenance enchantment spells)