In the very center of Templehelm, eons of years ago the Emeraldites who sailed to the land from Old Kilvaro built a temple to honor their god, Planu. Over the course of time, this temple has shifted in shape and design, due to the weathering, or the power of Planu. A power surges from it in all directions, nullifying almost all magic and historically protecting people from harm, though this appears to have changed in recent times. By Emeraldite reason, the strength of this power seems to depend on the strength of Planu.
Various Emeraldite studies have shown that emeralds are a great amplifier of magic, or perhaps even Planu's power. With an emerald of any sort, you can cast a simple teleportation spell to travel to the center of the temple.