Bastion is a gateway to Eclage Dungeon. It can be accessed from a portal found in Eden Dungeon (Lv:3).
If a player killed the summoned version of Nidhoggr's Revenge 7 times, Eden Dungeon will 'collapse', and the portal in Moonhaven 240 130 will take the player directly to Bastion instead. Likewise, if a player has already killed the summoned Firefox 7 times, Eclage Dungeon will collapse.
Getting to Bastion
Start of Eden Dungeon (Lv:3). The portal to Bastion is marked as a red 'x' on the map.
This is the portal to Bastion
Getting to Eclage Dungeon
After entering the portal, you will be teleported to Bastion. If you walk to the right, you can click on a Soldier who appears 'hidden' among the crystals. Talk to him to have him warp you to Eclage Dungeon.
If you've already submitted Lost Soul, you will be warped to Eclage Dungeon (Lv:2) instead.