Adrian's progress in immortality arts would be relatively slow. As for how slow, it depended on each person's aptitude. Whether or not to learn Blizzard Frost was ultimately in Adrian's hands.
After some thought, he decided to learn it. Learning one more technique couldn't hurt! Besides, this technique could temper his own mana, which benefitted him greatly. If his progress in the immortality arts was slow, so be it—there was no harm.
Then, Amara taught Adrian the verbal spell for Blizzard Fro