The Ioun Tower (Patreon)

Floating in the badlands in exactly the same manner that most towers don’t, this odd structure is evidently of ancient design and made of a strange bone-white material. There are several ways to access the tower, but for those who can’t fly the obvious choice is to bridge the small gap between the rocky cliff face and a breach in the wall of level 5 of the structure. Persons who can fly or dimension door are more likely to try the door on level 2, or on the narrow ledges of level 4.

Whoever built this or lived in it could fly or levitate by means personal, magical, or technological. The access points between all of the levels except for the top-most are via empty and perfectly smooth 20-foot-wide shafts. Access to the smaller tower off the side of the structure is only available via the narrow walkway on level 4, and again the tower’s levels are connected by a 20-foot-wide shaft that pierces every floor. None of the original inhabitants remain, but a number of flying pests have moved in over the years, including a nest of stirges occupying the highest point of the tower they could get to on level 2.

Hooks: Well, if a floating tower isn’t enough to get someone’s attention, just park a dragon on top. A long thin dragon that can climb through the 12 foot opening on level 5 and throw all his treasure down the shaft into level 7. The dragon of course then sits on the top of the tower watching over its domain…

The 1200 dpi versions of the map were drawn at a scale of 300 pixels per square and are 13,200 pixels (44 squares) wide. To use this with a VTT you would need to resize the squares to either 70 pixels (for 5′ squares) or 140 pixels (for the traditional 10′ squares) – so resizing the image to either 3,080 pixels wide or 6,160 pixels wide, respectively.

https://dysonlogos.blog/2023/01/12/the-ioun-tower/