>>535103109
Z is an Arcanist yes, it's mentioned directly in chapter 4.
>>535103075
How did you get that out of anti-racism 101?
>>535103137
They did have power at some point but then either their went to war with humans or humans attacked them (it's unclear but Matilda's line implies the latter is true.) and there were way more humans than Arcanists so humans won and Arcanists became second class citizens.