Girls like boys, not girls; that's the first rule Marella breaks. No Pyrokinesis is the second, and breaking that gets her banished to Exillium, where she's not allowed to make friends or fall in love. Because of Linh, that's broken too. As she falls in love, she finds other LGBTQ elves and together, they fight for equality. As long as unfair rules exist, Marella breaks the rules.