Honestly, Haukagaron was my favorite part of this. I would have been willing to learn much more about him! I feel similar about the difficulty of the location but it is easy enough to pull out of the abyss and use it as is in some other random location. Enjoyable location. Would be willing to visit but wouldn't spend the night.
In the old forest that Kaukenn was originally built under, such a pattern acted as simple camouflage among the sun-dappled shadows thrown by towering trees. Each marble block holds an enchantment subtly enhancing that effect, causing the veins to undulate slowly in a breeze or the colors to darken or lighten to match the ambient light.
A deceptively simple yet evocative detail!