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The first formation Ren installed on the rock, with Diana's help, was the Energy Gathering Array.
With the ancient altar serving as a natural formation node, laying these enchantments down became easier. Instead of planting them all over the rock, they just installed it on the altar itself, and the altar propagated the effect into the whole rock.
The Energy Gathering Array basically increases the density and quality of energies within this rock. This makes everybody's practice speed twice as fast with half the effort.
The next enchantment they laid down on the rock was for its defenses: the aura isolation array and the protection dome.
These make the rock look more inauspicious to the eyes of strangers and monsters. And if this effect doesn't work, then the protection dome creates a barrier to protect the rock's inhabitants.
Of course, this protection isn't absolute. But it's better than nothing.
