|Hoan kiem turtle|
|Species||Hoan kiem turtle|
|First appearance||The Return of Tsul 'Kalu|
Hoan kiem turtle is a turtle cryptid. It made its first and only appearance in The Return of Tsul 'Kalu.
The Hoan Kiem turtle is said to be a large turtle species seen in southeast Asia. Vietnamese legend tells the God of Lục Thủy (Green Water) lake lent the leader of the insurgent army against the Chinese invader a Holy sword called Heaven's Will. After the army won, a Gold Turtle appeared before Dragon Boat while the Leader—then the King was sightseeing—the Turtle asked the King to return the Sword and disappeared into the water. A Tower was built in the honor of the Turtle and the lake since then had been named Hoàn Kiếm (Return the Sword) lake. Nowadays, The hoan kiem turtle is supposed to be an extinct species of soft-shelled turtle. This is also said to be a strong cousin to China's extremely endangered soft-shelled turtle. The one seen in the episode must have been a hatchling.