So I've levelled "Mana Restoration" up to rank 6, and while the first few ranks seemed to improve performance, now it's restoring only about 5-6 mana per use? Is this a known issue? Anyone encountered it before? I tried quitting, restarting and reloading the save which hasn't helped. I don't really wanna reroll even though I'm only a couple hours in or so.

Cheers all.

Edit: I've just noticed that it consumes a lot more stamina if I have it to spare while restoring no more mana (still only 5-ish) - this cannot be functioning as intended!

It is possible that this is a bug - possibly one that was not reported so far. Unfortunately, the devs have disbanded and there is no one left to fix it. It is also possible that after you promote to the next rank the skill will start working correctly again... I'm looking into game rules I have at hand and according to them, moving from Apprentice to Disciple (which is your current rank, I assume) should decrease the amount of Stamina consumed, in fact. Journeyman should additionally restore more mana and Master should decrease the time of mana restoration on the top of it.