How do I complete the "The Thunder Helm" side quest in The Legend of Zelda: Breath of the Wild?

To complete "The Thunder Helm" side quest in The Legend of Zelda: Breath of the Wild, you must help the Gerudo people in Gerudo Town by completing a series of smaller quests. This quest is given by Riju, the leader of the Gerudo, after you have freed the Divine Beast Vah Naboris. The Thunder Helm is a powerful piece of armor that grants immunity to lightning strikes, making it highly valuable for exploring areas with frequent thunderstorms or fighting enemies that use electric attacks.

First, you need to speak with Riju in the throne room of Gerudo Town. She will explain that the Thunder Helm is a sacred relic of the Gerudo, but it is currently being used to protect the town from the Yiga Clan. Riju will ask you to help the Gerudo people with their problems, and once you have done so, she will consider lending you the Thunder Helm. There are four specific side quests you need to complete, each given by a different Gerudo resident. These quests are "The Search for Barta," "Medicinal Molduga," "The Mystery Polluter," and "The Eighth Heroine."

For "The Search for Barta," you need to find a Gerudo named Barta who has gone missing in the desert. She can be found trapped in the East Barrens, near the Southern Oasis. You will need to defeat a group of Lizalfos to free her. Once you rescue her, she will return to Gerudo Town, and the quest will be complete. Make sure to bring weapons and armor suitable for combat, as the Lizalfos can be challenging, especially in the heat of the desert.

"Medicinal Molduga" requires you to defeat a Molduga, a large sand-dwelling creature, and bring its guts to a Gerudo named Malena. Moldugas are found in the Gerudo Desert, and you can lure them out by throwing a bomb into the sand. Once the Molduga surfaces, attack it with strong weapons or use the environment to your advantage, such as by using the high ground to avoid its attacks. After defeating the Molduga, collect its guts and return to Malena to complete the quest.

For "The Mystery Polluter," you need to investigate the source of pollution in the town's water supply. Speak with Dalia, who will point you to the rooftop of the town's inn. Climb up and find a group of sand seals being fed hydromelons by a Gerudo named Liana. Speak with Liana, and she will stop feeding the sand seals, resolving the pollution issue. This quest is relatively simple and does not require combat, but you may need to use your climbing gear to reach the rooftop.

"The Eighth Heroine" is a more complex quest that involves finding a statue of an eighth heroine in the Gerudo Highlands. Speak with Bozai, who will give you a clue about the statue's location. You will need to travel to the Gerudo Highlands and locate the statue, which is hidden in a snowy area. Once you find the statue, take a picture of it and show it to Bozai to complete the quest. This quest requires some exploration and may involve dealing with cold weather, so make sure to bring warm clothing or elixirs to protect against the cold.

After completing all four quests, return to Riju, and she will reward you with the Thunder Helm. This item is incredibly useful for exploring areas with frequent lightning storms, as it prevents you from being struck by lightning. It is also helpful in combat against electric-based enemies, such as Electric Wizzrobes or Lizalfos with electric weapons.

One common mistake is attempting to complete these quests without proper preparation. The desert environment can be harsh, with extreme heat during the day and cold at night. Make sure to bring appropriate clothing, such as the Desert Voe set, or consume food and elixirs that provide heat or cold resistance. Additionally, some quests involve combat, so ensure you have a good supply of weapons, shields, and healing items.

An advanced technique for dealing with Moldugas is to use the environment to your advantage. For example, you can use the high ground to avoid their attacks and strike them from a safe distance. You can also use bombs to lure them out of the sand and stun them, giving you an opportunity to attack.

In summary, completing "The Thunder Helm" side quest involves helping the Gerudo people by completing four specific quests. These quests range from rescuing a missing person to defeating a powerful enemy and solving a pollution issue. Proper preparation, including bringing the right gear and supplies, is essential for success. Once all quests are completed, you will be rewarded with the Thunder Helm, a valuable item that provides immunity to lightning strikes.