Gaia's home was more than just a lake surrounded by a thick fog...
In truth, this same lake was the very first lake that was naturally formed with Spiritual Energy way back then. It is this very lake that springs forth astonishing life energy within this little valley, creating this tiny yet peaceful place where anyone could relax and feel their souls cleansed from all troubles.
Gaia chose to stay here because she likes it here, at the same time, she's also guarding this place since raw Spiritual Energy is abundant in here that many would covet.
This little lake is one of the few remaining natural treasure bowls left of this world, and being the collective consciousness of this world and nature itself, Gaia felt responsible for keeping this place safe.
And today, there's even more reason for her to guard this place closely...