What does quota mean?
Quota is a set number of characters a player has to defeat in the arena every week to defend the rank they have conquered. This is done to ensure that top ranking players cannot keep their rank indefinitely simply by avoiding the arena.
The number of characters which need to be defeated depends on the rank the character holds. The higher up the ranking the character is, the more characters he needs to defeat. The overview below shows the required number of defeated characters per rank:
Quota for the various ranks: