Darius' current situation was neither strange nor unique, despite being an Adept. All Faustian mages were able to unlock a new element every time they climbed a stage.
Some unlocked one, some unlocked two or more. It, just like the number of elements one awoke with, depended on a myriad of factors that could be summarized and substituted under one word. 'Talent'.
Now how would a Journeyman mage who awoke with a single element go about adapting to another after climbing from the Amateur stage? The same way as every other mage did it, no matter their stage.
Just like Darius was doing right now, they'd all learn the Basic spell of that element and practice it.
Of course, the difference between an Adept doing so and an Amateur doing so, was that the former had greater stores of mana, allowing him to practice longer. The Adept would also have more expertise with magic and a higher Intellect.
