Until the End of the World is a Genshin Impact World Quest set in Simulanka. You must battle a dragon named Durin, whose roots date back to the Witches' Circle. The battle doesn't involve any actual combat, so you'll have to rely on Simulanka's unique mechanics to defeat the dragon.

When the battle sequence starts, you will be forced to use trial characters. You can freely consume food to heal and revive, so don't worry about your team not having a healer or shielder! In the first phase, you can't damage the dragon, so just avoid all projectiles to avoid death. This segment is an endurance battle and will end after you've dodged attacks for about a minute.

After the endurance battle, a cutscene and flashback will start. Once you are done, go to the elevator up the stairs and attack the device with Normal Attacks until you reach the window, which you have to go through to enter the next stage.

Then follow the path to the castle-like entrance using the floating bridge and jumping blocks.