As they travel through the next one Astral doesn't state which side the runes are on quite as soon- staring at them in each room he's noticed slight differences. The depiction of something that looks almost like a sun in the center of the carvings, those surrounding it slowly depleting. The 'sun' is probably what they're after but...

Hnnn...

"The path directly ahead this time," he calls out, floating down toward the others.