I've been using mana shield with my lv 40 mage (~1000 mana) for quite some time now and I really like it. But...there is a but of course!
Can someone confirm that when I'm hit in either melee or ranged or by a spell then the full damage is subtracted from my mana reserves and absolutely no resistances are taken into consideration? Because sometimes I feel I just run out of mana too quickly.
Yes, all of them are at their maximum values - except of course for the physical resistance. I might try to capture a video that shows this behavior and post a link.
I think monster damage is just being unbalanced. Like, undead balrog's projectle does about half of my mana, while magma demon's projectiles barely scratch me.
After playing some additional hours, I can confirm what you said: monster damage is very unbalanced, but still have the feeling that even the ones inflicting less damage cause way more to my mana than my hp.