This valley lake seemingly has a gleaming stone crystal at its centre, beckoning those ashore to swim to it. Sometimes, corpses of aquatic creatures and occasionally some land animals can be seen floating in the centre of the lake, drifting silently with their bellies upward. It’s actually the capstone of a hollow spire, belonging to a temple long since sunken under its waters. Exploring it requires magic or suitable contraptions to breathe underwater, to reach some of the chambers still with air pockets.
The capstone itself resists theft due to having stored tremendous amounts of electricity over the centuries, and discharges it whenever someone draws near it.
