Dauntless HeartPrice: 1 S / 10 S
Stacked: 99
Use it to break the seal on Island of Heroes, where you can obtain lots of treasure by exploring the island.
You will get a Dauntless Heart by remaining online for 30 minutes during June 26 - July 23.
You can get 12 Dauntless Hearts a day at most.
Open JD Exploration System or right-click to unlock the seal.
If you have keys left after the activity, you can keep exploring the Yintai Temple.