Cavern Island

Cavern Island is an island that was first introduced in Dragons: Rise of Berk.

Dragons: Rise of Berk
From June 10, 2015 till June 11, 2015, Toothless can search for the Hideous Zippleback egg, as well as Barf & Belch's Mate and Offspring for 2 hours. He can also search for the Thunderdrum and Earsplitter in an hour from August 28, 2015 to August 31, 2015, as well as the Scauldron and Bonecrusher's Conquest in 5 hours from February 27, 2016 until February 28, 2016