SW Treasure: Zora's Regret is a Side Quest in the Second Wind expansion for Breath of the Wild. The reward for this quest is the Zora Mask, an item that grants Link the ability to swim up waterfalls. This quest is given by the Old Ranch Journal.
Overview[]
This Quest is activated upon reaching Hyrule Kingdom and loading the overworld of Hyrule. When this quest is activated, Link will be tasked with finding the Old Ranch Journal, which is located in the Ranch Ruins. The journal contains clues to the locations of four Treasure Chests, each containing a mask. The hint in the journal corresponding to the Zora Mask's location is as follows:
"The third was a funny looking Zora Mask. It was submerged in a lake named after a legendary musician."
The Treasure is located at Mikau Lake, which is north east of Zora's Domain. It is recommended to use the Zora Armor or stamina boosting potions to reach this location. Link can pick up the chest by using the Magnesis Rune. Opening it will give Link the Zora Mask, completing the Quest.