Excerpt: Conjurer's Bond

Unlike the rest of the tower, whose surface appeared to retain the natural appearance of the rock, the glyphs on the corners were all brightly colored with three main colors, orange, green, and purple. The coloring didn’t appear to merely cover the surface of each glyph, but rather to fill them like a vibrant, glowing gel pulsing through each intricate carving.
Each glyph didn’t have a set color, rather the color flowed between the intertwined glyphs, causing each glyph to change between one of the thee main colors on a regular schedule.
A careful observer might have observed a close proximity to the rate of change between the glyph colors and the rate of the steam pulses from the rocky base of the chasm. However, were any observers around the tower, it is unlikely their attention would have been captured by such a minute detail.
Instead, it is likely that beyond even the pulsing glyphs, the dominating feature of the tower, the aspect most likely to be noticed by the average party investigating the tower, would have been the fact that there was no visible entry into the structure.
There was no door, there were no windows, there was, in fact, no apparent break of any kind in the walls, at least as far as the thickening steam would allow the walls above to be seen.
Whoever had constructed the tower clearly had no need for doors or windows to gain entry. Well that was one possibility. The other, quite obviously, was that there had been no need for such conveniences to facilitate someone, or something already inside from leaving.