Rui read on with great amazement. It was formed when a tree underwent dungeonification after absorbing soil deep below the surface that was rich with highly powerful esoteric mineral resources. In a process that was not very well understood yet, the flora enlargened and mutated, expanding as it absorbed more.
What the scholars of this world had not quite understood yet was how flora was able to naturally integrate esoteric mineral ores into it and develop into all kinds of strange manners that utterly defied how said species of the plan evolved.
Some thought that the esoteric mineral ores were somehow slowly refined and naturally integrated into the biology of the plant, giving it strange and seemingly reality-defying properties and characteristics that created strange environments inside the dungeon.