Mana starved forging is supposed to make hammer throw work even when out of mana.
Unfortunately, this does not work. I see my mana pool go into the negative and if I hold the cast button, it jumps between -1 and -7. So yes, I can throw hammers at 0 mana, but the attack speed is much, much lower. Might be that the game doesnt understand negative mana? Because it seems that as soon as mana recovers to 0 (from -7) I can attack again, then it drops to -7 again and I have to wait a second or something.
This bug makes the skill and my build unplayable. Hoping for a bug fix. Have seen this issue a lot when looking for it via google or Steam.