You can gain access to the Atlantean Remnants, which are your gateway to the Trials, by taking a special Atlantean ship, which will depart from one of the following locations:
- Albion: Caer Gothwaite dock
- Midgard: Aegirhamn dock
- Hibernia: A new dock on the river at the base of the Grove of Domnann
The masters at the portal keeps in each of the realms have created medallions of passage that will allow adventures to travel to the Remnants of Atlantis, and the housing merchants will also sell scrolls that will transport you to the Trials of Atlantis region.