The Strife at Camlann

Lancelot, as part of his promise to Gawain sends Arthur reinforcements of all the knights who had defected with him but it’s not enough. The loyalists are outnumbered sixty to one. Mordred has traitor knights, Picts, Scots, and Saxons on his side. It’s an army sixty thousand strong against Arthur who barely has enough men left to hit a thousand. Literally everyone who hates Arthur, and Arthur’s just like “Fine. Let’s go kill some whoresons and get our throats cut.” At last, the final battle starts, and EVERYTHING goes wrong. Despite being outnumbered, the loyalists are fighting back with everything they got. Men are dropping like flies and no one’s truly winning. Pretty much EVERYONE on both sides dies, with only seven surviving. Sandde Angel Face survived because everyone thought he was so man-pretty, he had to be an angel in disguise. Morfran survived because everyone thought he was so ugly he had to be a demon. Cynfelyn survived because his horse literally outraced all the arrows being shot at them! Pedreg and Derfel were super strong, so they survived off raw strength. Geneid the tall survived because he was faster than anyone. And Bedivere survived because this man survived since the days of Vortigern, and Uther and no young upstart was gonna kill his no-deaths streak here!
Anyway, Mordred himself killed off Kay, Yvain, Lucan and Marrok before going after Arthur.

-Arthurian Myths Retold pg 199