When playing Lost Ark, you can earn different collectibles as rewards after searching across the Procyon Sea, one of which is called the Giant's Heart. As outlined in the Collectibles list, there are different ways of acquiring these collectibles. There are also different rewards that you can unlock by visiting Wisdom Isle and speaking with Minerva.
How to get the fifteenth Giant's Heart in Wisdom Isle in Lost Ark
The Fifteenth Giant's Heart is the last one that you can obtain and takes the longest amount of time to acquire. In order to acquire it, you need to have completed all of the previous 14 Giant's Hearts requirements. Once you've obtained the fourteenth Giant's Heart, you will have access to a quest titled Reinvigorating Giant's Heart immediately afterward as a reward for completing it. To complete the quest, you must complete the Tier 2 Abyssal Dungeon, called Gate of Paradise. Abyssal Dungeons can be started at the Abyssal Dungeon Board in the Military District.
Once you complete it, you will have the Giant's Heart automatically bound to your character. Since it is the last Giant's Heart you can earn, you'll also have the opportunity to earn the Giant's Secret Chest reward from Minerva on Wisdom Isle. This reward grants you both the Resonance of Soul title and the Giant's Hand Statue for your stronghold.
Where is Minerva on Wisdom Isle in Lost Ark?
Wisdom Isle is located in the Platina Ocean of the Procyon Sea, which is directly east of East Luterra. When you arrive, you will find Minerva inside the front entrance of the library.
For more Lost Ark, check out Where to find the eleventh Giant’s Heart in Azure Wind Island in Lost Ark? and Where to find the thirteenth Giant’s Heart in The Tower of Fate in Lost Ark only on Pro Game Guides.