Final answer:
Arthur and Modred both play pivotal roles in the carnage, representing leadership and the tragic outcomes that arise from their feud and the ensuing battles.
Step-by-step explanation:
The roles that Arthur and Modred play in the carnage are central to the themes of conflict and power struggle portrayed in their story. Both figures, likely derived from the legends of King Arthur and Mordred, symbolize leadership entwined with destiny and downfall. Their involvement in the destruction is intrinsic to narrative arcs that often highlight the tragic outcomes of heroism, betrayal, and war.
In this context, Arthur and Modred's actions propel the events leading to the carnage, underlining the dire consequences of their tumultuous relationship. Whether their roles are direct or symbolic, they serve to demonstrate the chaotic aftermath of their rivalry and possibly a larger commentary on the nature of leadership and combat.