Why did nabu have to die?

Nabu's death in the "DC Comics" universe, particularly in "Justice League Dark," serves as a pivotal moment that emphasizes the stakes in the battle against dark magic and the looming threats posed by powerful entities. His demise underscores the sacrifices made by heroes and the complexity of their struggles against malevolent forces. Additionally, it allows for character development and the exploration of themes like loss and the consequences of power. Ultimately, Nabu's death catalyzes significant shifts in the narrative and the dynamics among the characters involved.