"Obsidian" by Jennifer L. Armentrout explores themes of love, identity, and the consequences of one's actions. The story follows Katy, a high school student who moves to a small town and discovers that her neighbor, Daemon, is not just an ordinary teenager but an alien with extraordinary powers. Their tumultuous relationship is marked by tension, attraction, and dangerous secrets as they navigate their intertwined fates. Through their journey, Katy learns the importance of resilience and facing the past while embracing the future.

The quote "What done is done. We need to move forward" encapsulates a crucial lesson in the narrative. It emphasizes the need to let go of past mistakes and look ahead, reflecting the characters' struggles to overcome their histories and the challenges they face together. As the plot unfolds, the characters embody this idea, showing that growth often comes from acknowledging what cannot be changed and focusing on the possibilities that lie ahead.