1087. Only 100 Years?

"Well, I will set up a research group with some of the runesmiths and the elves. Just because you don't want everyone inside yet doesn't mean we can't see and research those runes outside the tower. I also know that the stone used is a mix of obsidian, mythrill, and orichalcum. There are blue and green streaks from the metals. The real question is how they formed the lava in to perfect blocks like that before it cooled in to pitch black obsidian. I can tell from here that there are no bubbles or impurities. The process had to have been perfect." The king of the deep caves was trapped in thought along with a few of his dwarven craftsmen that had rushed to the scene. 

"But the major repairs and building projects in the city come first, right?" Walker knew that making this point was all he could do. He didn't take his eyes off of the dwarf king until he received a grunt and nod.