Find a mage who can help you
After getting the rune (destroy magic barrier) from Ursegor's sarcophagus (see Find all the pieces of the Titan Armour), you should talk with Illumar (yellow). You can tell the mage to create the scrolls but you can do it yourself as well (after completing Talk to master Illumar). It's worth choosing the first option, as you will save ingredients ant time (Illumar creates 5 scrolls at a time).
Take care of Brogar for good
If you let Brogar (red dot) live in the first chapter, he will be waiting for you in the temple (M7.2) from The Titan Helmet quest. This time you have to kill him for good.