Obelisk of Blight

Entrance is in the Southwest area of The Lesser Faydark with Shadowed Men and Demons
There is only one re-pop in the whole zone, an advanced automation, circling the ceiling in the center chamber of the final encounter area. This is certainly the guardian mentioned in Tower of Zet Scroll No. 3.
This zone is also known as the Tower of Zet. For Lore about this zone, see Obelisk of Blight Lore and Shadowed Man Lore.
It is worth noting that the name of this tower, Zet, is similar to The Tower of Vul (which is mentioned in Tower of Zet Scroll No. 1) in The Feerrott, and that Zet is the name of one of the Druzaic Shrines.