The fallowing letter has been sent to Winya, The Grove, Cordor, and Mystras Tower for their leaders eyes only.
I will get to the point here and now, the obelisks and the Undoer threaten us all and I have found some research for all who fear the threat it brings. First let me say that an Obelisk has appeared in Eilistraees Shrine, second allow me to tell you I have found out that each of the Obelisks has a minor illusion making the runes seem like the primary focus of its power, in fact hidden below this is a depression in the stone that looks as if it was designed to fit a gem or cut stone, the depressions can be found at random points on the stone and do not seem to be aligned to any direction.
I have also taken the liberty of having a map made of the known locations of the Obelisks, if you may note they are one point short of forming a pentagram with the last point being very near Cordor.

That having been said I and my friends came to the conclusion that our theory about the Obelisks being tied to the war between the Drow and Winya that seen Winya forced from this plane in the first place are very likely true, Cordor was the sight of the Dark tower of the drow and heart of the attack forces against Winya and its Lifestone. We have also noted several instances where it seems as if the undoer has no wish to attack drow who do not attack it. Regardless of our theory that this is all part of some long lost drow super weapon, me and my friends explored the only known ruins of the Dark Tower of the Drow, the Catacombs of Cordor and the cult of the horned rat haveing built around them. The drow ruins were picked clean of all but one thing that caught or attention Included below is a drawing of what we found.

This worries us greatly and we suspect that if this and the Undoer are lost drow super weapons and that this place under Cordor will be the epicenter of the coming evil. I implore you to nip this in the bud and you who have vastly more resources to examine this obelisk under Cordor in the ruins of the Dark Tower. I know not what will happen if the last Obelisk rises but I fear Zanshibon sinking in the abyss or the great quakes of Cordor will pale in comparison.
-Your friend Erelkacha Kenlyl High Priestess of Eilistraee.