Knowing more details about where the experiments to make a longer term dark dome around just a small greenhouse was good.
Since the issues with planting herbs that would naturally draw in more manas from the surroundings was the fact that they would grow and damage the rune materials was useful. It meant that if any methods of herb ground around the greenhouse was used, it would eventually lead to constant maintenance. And since that was the case, the dark dome would fail whenever repairs were made or needed to be made. A higher chance of failure.
If the rune formations used could only be temporary because eventually the manas would become too dense and damage the materials they were carved on, then it also made sense why the materials were being stockpiled nearby. It was clear that even focusing more heavily on the formation itself might be the wrong path due to the fact that the more mana drawn in the faster the degradation would be.
