In the narrative presented in Darren Shan's "Ocean of Blood," the theme of warfare reflects a dark facet of human nature, emphasizing the relentless pursuit of destruction among tribes. The constant strife is portrayed as a competitive struggle, where different groups strive to outdo each other in the heinous acts of violence and atrocities. This grim portrayal suggests that the human capacity for cruelty is not only present but also exacerbated by competition.

The text illustrates a world engulfed in chaos, where inventive methods of killing become a priority rather than a concern. The description evokes a sense of hopelessness as it highlights how conflict seems entrenched in humanity's fabric. It serves as a commentary on the troubling aspects of war and the destructive tendencies that define human interactions when driven to extremes.