For those who are not familiar with how ranked Feast works, when you hit certain milestone ratings it puts you in a set of qualifier matches. You have to win 3 out of 5 of the matches to be promoted to the next tier, and if you fail you have to regain any rating you lost for losing and go through the qualifier games again. Diamond is the final tier which makes for an especially tense and thrilling set of games, but winning that last game feels amazing.