Neverstone

The Neverstone is a crystal that appears on Smurfling Island in the EMPATH: The Luckiest Smurf story series. It is considered the source of youth and immortality for all the island's residents, as its power extends to a certain distance from the island itself. It also casts a shield around the island that renders it invisible to all but Smurflings and those who are Smurflings at heart, like Grandpa Smurf and Nanny.

At the current point in the series where the Neverstone first appears, it is losing its power to maintain the longevity and immortality of its residents and must be replenished with the purest samples of the four known primal elements -- earth, fire, water, and air -- within a certain time period before its power completely fades. However, Captain Smurfhook, who has grown tired of living as an immortal, wants to get his hands on the Neverstone to destroy it completely so that he and his crew of pirates can eventually die peacefully, which has resulted in a constant war between himself and the Lost Smurflings, who are the protectors of the Neverstone.

Grandpa Smurf, who was the original Smurfling Pan, was sent on a lifelong mission to find the purest samples of the four elements and then years later recruited the help of the Smurflings from the Smurf Village to get the samples and use them to restore the Neverstone's power, all the while keeping Captain Smurfhook from getting his hands on the Neverstone.