Drusilla

After the horrible events in the Clave-Fave meeting, resulting in the death of Alec Lightwood's father, Robert, and Annabel Blackthorn's terrible actions on a member of her own blood-kin, Julian Blackthorn and Emma Carstairs take to their heels after the Lord of Shadows and Annabel, bent solely on her capture.
Drusilla Blackthorn and Cristina Rosales have no idea where to find Jaime, but Drusilla's secret is something that will damn Livia, or revive her.
Diego Rosales is white-hot, killing-rage, and icy, icy determination combined, and Zara and Horace Dearborn shall soon learn the consequence of making a Rosales dance in their farce of a tune.
Tiberius Blackthorn and Christopher Herondale are now more determined then ever to take the Unseelie King down, by themselves, if so necessary, and the Angel damn the Clave, the Consul, and whoever might dare to stop the Last Herondale, and the twin of Livia Blackthorn.
Octavian Blackthorn is only seven. But he is a Blackthorn, and Mark is more Blackthorn than Faerie than he has has cause to be.
They are Shadowhunters. More importantly, they are Blackthorns, and Cristina, Diego, and Emma have love, loyalty, and life spent with them. And they have none to spare on the Clave, the Conclave, the Council, but just perhaps a shard, for the Consul, mother of Helen Blackthorn's wife, and so Blackthorn loyalty extends to both Aline and Jia Penhallow.
Sed lex, dura lex, but now, Helen, Aline, Mark, Julian, Drusilla, Tiberius, and Octavian will follow their words, and Livia will not forget Malla Lex, Nulla Lex as their fight to stay together passes their own mortality, and surpasses any effort to lay them claim of the Clave.
Love is stronger than Law, and the Blackthorn's will tear Heaven itself apart for their final peice, their missing soul. And Livia fights to remain, secure and solid in her love and her faith in her family. She is a Blackthorn. She will care none for a bad Law, and less of a good one, and will return.