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Besides the Guardians of Xelorium, only one person can repair the temporal rip which has allowed Altdemons to invade the private domain of the Great Timekeeper: Henual, the Overseer of Time. You just have to convince him to help.
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→ They are found at [1,1], [2,2], [3,1] and [4,1] in the Present Day. There is a chance you will be attacked by them, but they are not very dangerous, and you can fight them with a team. Henual will only appear in the hidden room behind the falling blue sand within the structure at [3,6] in the Gonebyways when you have the Dimensional Fabric and all Silk of Time Threads in your inventory.
Push the Altdemon wave back
This fight can be done with a team. You must defeat 3 waves of 5 Altdemons total. This fight is not very difficult with at least 2 level 200 characters using reasonable equipment.