As you continue through the story of , you need to get three types of Keys to unlock new areas in the world. As your exploration is halted by Red Doors, Blue Doors, and Prison Doors, you'll need to collect each type of Key. Not only will this help you find new treasures, but you will also be able to progress the story.
The three Keys you can collect are the Thief's Key, Magic Key, and Ultimate Key as you travel with your party. Each Key can unlock a different type of door that, normally, your group can't open as you find them inside various locations. Some of the best equipment in is locked behind special doors, so you'll want to get every Key for more than just advancing the story.
Some changes in 's story from the original game cannot be seen until you get the Thief's Key from the Dreamer's Tower. This area is on an isolated island to the far west of the overworld map, which you can reach by traveling underground. Go through the Promontory Passage tunnels to arrive at Dreamer's Tower much earlier in the game than you might expect.
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Getting to the top of the Dreamer's Tower dungeon will let you collect the Thief's Key from an old, sleeping man on the area's fourth floor. Thankfully, you don't have to defeat any bosses to obtain the Key, as the old man just gives it to your party when you simply talk to him.
The Thief's Key in can open Red Doors, allowing you to access areas all around the map. Several locations inside Aliahan Castle are locked behind Red Doors, so try to revisit this area once you get the Thief's Key to grab some great loot. Some Gold and items, such as the Seed of Wisdom, can be found once you open the Red Doors your party finds while exploring.
One of the best things you can get by unlocking a Red Door is the first of many friendly monsters your party can recruit for the Monster Arena. Assembling a team
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