We will correct the Adeptness Codex description (from Lost Realm (Lv 20+) to (Lv 21+)) during next month's update maintenance. We apologize the inconvenience and confusion the error may have caused. Thank you for your patience and support!
I think there should be no lvl limit. people who play from beginning can start collecting codex. It is not that we need only 10 codex per hero. We need a lot of codex!
When we reach Lost Realm Lv 21, we cannot get the codex for 100%.
And, you know CC has so so so many heroes, I think about 1000, how can we get enough adeptness codex to level up even 10 heroes?