Unlock Level: unlock Lv. 38
In the bottom right corner of the page (under the tasks panel) click on the system icon to open the page.
Game Rules: If the players successfully complete the activation requirements, they can activate different Knight titles.
After completing each requirement they can get a requirements reward, after collecting all the rewards they can activate the Knight titles.
Activating titles allows getting a huge amount of stats bonus, and increasing the whole heroes team stats.