Crimson Scarab Corruption

Walkthrough

 * 1) Speak to Aun Ol'tra at the Encampment near Rynthid Infested Plains.
 * 2) * Route: Use Rynthid Recall or take the Dangerous Portal Device from a mansion to Center of the Obsidian Plains and run to 61.6S, 63.3W.
 * 3) Head to Bah'Ktar's Tower at 62.7S 66.6W.
 * 4) The dungeon consists of a series of rooms filled with Tumeroks and Rynthid enemies.  Many rooms have portal traps that appear and disappear periodically.  Avoid running into these as they will drop you back at the start of the dungeon.
 * 5) Proceed through the dungeon until you reach a room with a ? tumerok.  Kill him to spawn the portal to the boss room.
 * 6) * Warning: The boss room is a hot drop!
 * 7) In the boss room are a ? lightning elemental and the boss Bah'Ktar (Tumerok).  Kill them both.
 * 8) Loot a scarab off of Bah'Ktar.
 * 9) Legendary Keys will spawn on the ground.  Loot one and use it on the chests which have spawned in the room.
 * 10) * Note that there is a countdown timer on the chests. So loot quickly!
 * 11) Return to Aun Ol'tra and give him the scarab for rewards.

Images
Click image for full size version.