The House of Tuzu

Tuzu is the tribe’s name for the island’s great central volcano. The ancients built a magnificent building in Tuzu’s name, containing mystical secrets for those who dare to approach. The House of Tuzu is a community lot near the western shore of Felicity Island, one of the neighborhoods shipped with The Sims Castaway Stories. Like all community lots, it can be visited by using the travel map. A path to the east leads to the Jungle. Inside the temple there is quite a lot of treasure (though only viewable). Its main treasure is the Chalice of Youth, which can turn an elder Sim into an adult.

In the Shipwrecked and Single story, Professor Rhinehart tells the protagonist that the cure for the disease must be inside the House of Tuzu, but that it's sealed and can only be opened with the Staff of Tuzu. He also says that the staff is hidden in a petrified tree on Volcano Island. The protagonist takes the risk to believe him, finds the staff, and brings it to him at The House of Tuzu. On their journey to Volcano Island, the protagonist finds Bart Pittman, who reveals that Rhinehart is responsible for the Queen Solomon's shipwreck. The protagonist returns and goes to The House of Tuzu to confront Rhinehart. Professor Rhinehart reveals that, years ago, he had been to Felicity Island before and has been trying to get into The House of Tuzu ever since. When he witnessed its power, he became determined to steal the Staff of Tuzu. Rhinehart managed to steal it, but the natives drove him from the island before he had the opportunity to use it. Before he left, Rhinehart sealed the House of Tuzu with the staff and hid it in the Petrified Forest. He then planned to return to the island somehow and finally use the staff to open the House of Tuzu and use its power. In the end, using the staff at the House of Tuzu, the protagonist opens Rhinehart's way to eternal life. Once Rhinehart drinks from the Chalice of Youth and turns into an adult, Shaman Amanaki shows up. He tells the protagonist that they have the power to choose Rhinehart's fate with the staff. The player is given the choice either to banish Rhinehart or reward him by giving him youth, ironically by turning him into a toddler.

Trivia

 * After the story is finished, any playable elder Sim can travel to the House of Tuzu and use the Chalice of Youth to turn into an adult, at the start of the adult lifestage.