Good luck to you, nightmare Ranger
My male Priest is now level 28, "Poem Priest" I've named him.
I've tried to find a Cuirass, Leggings, Belt, Helmet & Gauntlets that have the name "Priest" in it ! This is great to try and only my Gauntlets are a "Mage" one, but every level I do again a "Travel & Trade Tour of The Ten Thousand Traders" ... no no no , not sooooo much of course, it's just because it sounds more funky this way

!
This time I've stopped to wear pieces of a Set (like the Archmage Belt etc!) because it feels a little bit like "cheating" when worn the Archmage Belt + another piece of that Set so the Belt gives + 5 Mana Regeneration per second (and more) !
Even without this boost and using many Mana as a Priest (Hide in Shadows, Charm, Blind, Fear, ... and Fireball as offensive spell), the Skill Mana Efficiency is a wonderful help !! Together with Lifetap it's already a looooong time ago since I need a Mana potion (or Healing potion, thanks to my Summon Ghostly Ghost!).
The only skills I've invested in are Priest skills, eccept Fireball and 1 point in Mana Efficiency & 4 points in Encumbrance * and 5 in Lockpick.
* way more easier to pick up all the goodies and I've now ALL the Books from Broken Valley & Sentinel Island taken with me to my Battle Chest, so if I'm hungry for letters I can read so many letters while Kirill play for me his lovely "Slavic Theme" !
Happy Hero,
Poem the Priest
Fun, at least !