With many possibilities

You check out your character sheet, and nod to yourself.

As you are now level 3 you can use the Claimant Crystal of your own (but will wait) and can probably see if there are any sub-classes.

Heleu was making sure everyone recovered safely from the herbs.

Hmm, let’s see what sub-classes were available.

Some were crossed out as you were not qualified for them.

You could also plan your future here if you wanted to Multiclass the next time you leveled up. You could change the Multiclassing any time before you leveled up again, but the sub-class you picked now could booster the effect of the other class latter.

Suddenly you frowned and wondered to yourself if with the system being as it is now, could you change your sub-class latter, and what exactly were the effects of not picking a sub-class?

You would have to ask that latter