Fire Cave
From LeikaRO wiki
Overview
Fire Cave is a hub that you can enter after completing Dimensional Travel. Sylph Cartographer will also teleport you here.
From here you can access the new instances, Bios Island, Mors' Cave and Devil's Palace.
Chaco resides here, he's the one in charge of distributing and enchanting Hero's Signet.
Hridalf has recently joined the expedition and offers his services in the form of Heroic Gear Enchants.