Final answer:
The theme best presented by the plot event is 'We are stronger with many than we are on our own'
Step-by-step explanation:
The theme best presented by the plot event 'When the Goblins and Wargs attack, the dwarves, men, and elves unite to fight the enemy' is We are stronger with many than we are on our own. This plot event shows how different groups come together to fight a common enemy, emphasizing the idea that unity and cooperation can lead to greater strength and success.
Learn more about theme in literature