Legends are a great way to earn rewards by completing various in-game tasks during events.
Players will need to complete the legend objectives in order to progress to the next legend tier. These tasks will usually incorporate a mix of PvE and PvP elements and can vary in difficulty. Some legends will even let you choose the difficulty... so you better make sure you're ready for the challenge!
As soon as you complete an active legend, you should be notified via an in-game popup notification. You will able to collect your rewards immediately by making your way over to that specific legend's screen.
Completing legends during events is a great way for players to actively progress and grow their kingdoms!