After defeating Devimon, the DigiDestined are contacted by Gennai, who tells them to travel to the Server Continent to retrieve artifacts called Crests, which allows their Digimon partners to Digivolve past their current level. After defeating Etemon, the DigiDestined are tormented by Myotismon, who attempts to prevent them from using the power of Crests. Myotismon searches for the eighth DigiDestined in the human world, and the Digidestined and their Digimon return to the human world also to find the 8th child first. This 8th child is soon found out to be Tai's younger sister, Kari. When Myotismon reveals his true form, Agumon and Gabumon achieve Mega forms through Warp Digivolution to defeat him.