Latin in city of lost souls?

In "City of Lost Souls," the fifth book in Cassandra Clare's "The Mortal Instruments" series, Latin is often used as a language of magic and ancient spells, reflecting its historical significance in the world of Shadowhunters. Characters frequently recite phrases or incantations in Latin to summon powers or invoke protection. This use of Latin underscores the series' themes of heritage and the deep-rooted traditions of the Shadowhunter society, linking their present struggles to a rich and complex past.