Tears of the Kingdom offers players a multitude of ways to interact with the lore of past games in the Zelda franchise. One of the main ways is through recognizable equipment and weapons from previous titles, with many of those items being the most powerful in the game. Twilight Princess in particular has some notable callbacks in TOTK, with one of the strongest being Ganondorf's weapon The Sword of the Six Sages.
Ganondorf's Sword of the Six Sages has been renamed the Dusk Claymore in TOTK, and is one of the strongest swords in the game thanks to its 32 base attack power. It's also extremely useful being that it's a one-of-one weapon, thus allowing players to buy it back at any of the Bargainer Statues in the Depths. However, getting it isn't easy: the Dusk Claymore can only be received by completing the Investigating the Thyphlo Ruins side adventure after beating the first four temples and receiving their sage powers.
The Dusk Claymore's History as the Sword of the Six Sages in Twilight Princess
In Twilight Princess, the Six Sages imbued their power into a powerful weapon dubbed the Sword of the Six Sages. The Sages attempted to slay Ganondorf with that very sword, but the Triforce of Power awakened within him and saved his life. Taking his fate back into his own hands, Ganondorf took that same sword and used it to kill the Sage of the Water.
In a last-ditch effort, the remaining Sages banished Ganondorf to the Twilight Realm. The Sword of the Six Sages was sent there alongside him and became his weapon of choice from then on. Being created directly from the power of the Sages, the Sword of the Six Sages is one of the few weapons that can actually parallel the strength of the Master Sword. This also makes it the perfect weapon to be wielded by the Demon King.
How to Complete the Investigating The Thyphlo Ruins Quest and Unlock the Dusk Claymore
In order to complete the Investigating Thyphlo Ruins Quest, players will have to have beaten all four temples highlighted in the regional phenomena quest. After unlocking all four of those sages' powers, players can then visit Thyphlo Ruins (coordinates 0343, 3133, 0180) in Northern Hyrule just north of Korok Forest. Speaking to Kazul at the base of the Thyphlo Ruins Skyveiw Tower will initiate the Investigating The Thyphlo Ruins side quest.
With all four sage abilities unlocked, there will be four stone tablets that have risen from the ground, each consisting of a riddle corresponding to a section of the ruins. Players will have to find the area of the ruins hinted at in the riddle, then use the corresponding Sage's ability to prove that they’re worthy of the reward hidden there. After all four riddles have been solved, a secret passageway will rise from the ground to the east of the Skyview Tower. Inside, Kazul will thank Link for helping with his investigation and give him a Large Zonai Charge, a Big Battery, and a Diamond. Further inside the passageway, players will also find a chest filled with the real prize: the Dusk Claymore.
Where to Use the Sage of Lightening's Ability at Thyphlo Ruins
After beating the Lightning Temple, a stone tablet will rise from the ground at the Thyphlo Ruins Skyview Tower base with the following riddle: "Display the power of the Sage of Lightning at the end of the long dragon that protects the mountain of death." The statue in the riddle can be found at the coordinates: 0416, 3158, 0174. After using Riju'a ability on the statue, an ancient room will rise from the ground containing a chest of three Topazes.
Where to Use the Sage of Wind's Ability at Thyphlo Ruins
After beating the Wind Temple, a monolith will appear near the base of the Thyphlo Ruins Skyview Tower. The riddle states: "Display the power of the Sage of Wind to the owl protected by many dragons." The owl statue detailed in the riddle is located at the coordinates 0365, 3059, 0175. After using Tulin's ability on the Owl statue, an ancient room will rise from the ground containing a chest of three Sapphires.
Where to Use the Sage of Water's Ability at Thyphlo Ruins
Once players have beaten the Water Temple, a stone tablet will be made available near the Thyphlo Ruins Skyview Tower base with a new riddle: "Display the power of the Sage of Water in the presence of the six dragons." The six dragon statues alluded to in the riddle can be found at coordinates 0185, 3181, 0174. After using Sidon's ability while surrounded by the six dragons, an ancient room will rise from the ground containing a chest of five Opals.
Where to Use the Sage of Fire's Ability at Thyphlo Ruins
After beating the fire temple and unlocking Yunobo's sage power, a stone tablet will rise from the ground near the base of the Thyphlo Ruins Skyview Tower bearing the riddle: "Display the power of the Sage of Fire to blaze through the space between the dragons, from head to tail." The two dragons in question can be found at coordinates: 0175, 3093, 0174. Players will have to use Yunobo's ability to send him down the corridor between the two statues, from the tail toward the head. After doing so, an ancient room will rise from the ground containing a chest of three Rubies.