Complete story — includes the ending
The clans hold a fight to the death at Polis to determine which clan will receive the shelter. Octavia, Roan, and Ilian represent their respective clans. Luna also fights, but explains she will not let anyone into the shelter if she wins. During the fight, Echo is discovered to be cheating without Roan's knowledge and is subsequently banished by Roan as punishment. Octavia decides to ally with Ilian, but he is killed with an arrow to his neck by Echo. Later, only three warriors are left; Octavia teams up with Roan to take on Luna, but a storm of black rain arrives which puts both of them at a disadvantage against Luna, who is a Nightblood. Although Luna kills Roan, Octavia eventually defeats Luna and becomes the winning champion. She decides to share the shelter equally with the clans, allowing 100 survivors from each clan. It is then discovered that members of Skaikru settled in the bunker during the battle and sealed the door.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of The 100 episodes. HTML formatting and reference markers removed. · Content license