I'm trying to figure if I should use Tamas+Omega or Balrahn+Omega. The +5 int and mnd is nice on tamas but the mag acc +4 on Balrahn I think beats it. I'm not quite sure :/ I'm pretty sure 1 mag acc = 2 mnd, 2 int, and 2 chr.
Ampoules are gained by doing Einherjar which starts with a 'lamp' that this NPC sells, be warned that if you don't have the good alliance set up it can get pretty ugly >.> i've only done it twice so... I can't give you more details on it except that you get Ampoules from Einherjar as a reward :)