Kingdoms of Amalur: Reckoning Factions Walkthrough Part 11 – Travelers Part 4: Mirror, Mirror

The Glass of Ambient is found in the Blackened Hall. The Hall is found in the southeastern portion of the Tywili Coast. Head on over there when you are ready. If you have a good detect hidden then you can gather a lot of components running through here. Collect Buru's boots but they only last for a minute or so. After that, they will crumble away. Do not put them on until you are facing a lot of traps. Which is none too far away behind the door going east ...

Aisle of Flame
This is the first stretch behind the door. Use Buru's boots and dash across otherwise you need to slowly make your way over, disabling traps as you go. For the second portion of the Aisle of Flame, walk down the center between the traps to quickly make your way through. Repeat this for the third section.

Push the Erathi Sigil-Stone at the end of the Aisle to disable all the traps. This will also some a few Niskaru Bloodhunters to be wary moving forward. Be sure to explore around this room after you deal with the Bloodhunters as there are chest to claim in the room to the west and along the southern wall. Head northeast out of there to reach the next trial, the Dark Maze

Dark Maze
Enter into the room and you have a Niskaru Bloodhunter prowling around. Attack him and three more will join in on the attack. Head south to enter the next part. Here you will again be fighting Niskaru Hunters and Bloodhunters, a total of three. Defeat them, attempt to go through the southeastern door, but it will get blocked up. After that, go through the northeastern door to make it through to the next part. Head north, toward the wall. As you approach you will find it moves to admit you. Turn right after that then go north when you can. Turn east, go through the door and approach the wall to get it to move. In the chamber beyond the wall you have another singular Bloodhunter. Attack and two more Hunters will attack you. Head south and east. When you reach the next part of the passage that widens, you will encounter three more Bloodhunters. Just continue east after that. You have cleared the Dark Maze.

As you turn north again, you will find another trio of Niskaru waiting for you. Just a little ways down the path you will find more Niskaru Hunters waiting for you. Kill then and continue on. Once the path turns north into a door, you are facing the room with the Guardian.

The Guardian
 It is a weaken Niskaru Tyrant so you can easily floor it. Once you do, place the amulet on it and remove the Tear from it to freeze it. Now turn around and claim the Glass of Ambient.

The good news about leaving is you can head straight west, cutting a lot of time off from running around parts. You can also just run across the traps in the Aisle of Flame as you turned them off. Now talk with Grim to finish out this part of the quest.