The Temple of Equilibrium is a temple located north of the Muggy Plains, it is allegedly the last uncorrupted place of the plains. The building consists of 7 floors and it is mainly ruined. The right part of the temple is only accessible after climbing up the tower and then descending it again. However you may use levitate spell to get to the first floor on the right side from the second floor (the left side). You just need to look for it.
Creatures in Temple of Equilibrium
Below is geographic spoiler, if you wish to explore it by yourself, stop reading here.