The Iron Tower is an enormous building of twisted iron in the middle of the Lost Peaks. In reality, it is a crashed astral ship utilized by the Illithid during an Exodus of their doomed home-world.
In 1486 DR, Penelope Harpell sent Seekers to investigate this rumored location as part of her objective of mapping the entire continent.
Upon arrival and after encountering bizarre technology and creatures, the adventuring party eventually discovered an artificial life-form commanding the remnant of the ship still functioning. There, the intelligence revealed to the group of the origins of the mind flayers and their extra-terrestrial nature. Upon discovering that the mind flayers still existed in their world, a satisfied intelligence activated the self destruct of the ship and the group only barely escaped. Before leaving, however, the group discovered on a map the other location of a different astral ship located near Silverymoon.
Zenvalros also received a vision of the fate of the Illithid as a result of his pact with Death. The vision described the decadent brain-drinking lifestyle of the mind flayers in buildings as tall as the clouds, the eventual appearance of a green robed man holding a scale and the great hunger and scarcity of resources that then overtook the entire world, with the remaining survivors deciding to escape it on astral ships.
Destroyed in 1486 DR.