The Heart

The Heart is at the center of a circle, know as The Barrier, formed by five other structures; The Library, Ivy Cay, Vault of Relics, Selfless Crypt, and Tomb of the Damned. The Heart is a giant castle which sits atop the tallest mountain in Corlinth and is overseen by The Guardian. This castle is vary tall, comprised of many towers that reach far into the clouds and deep wells which extend far into the ground.

The tallest of the towers has an observation deck siting just above the mist and fog. Making it the only way to get to the Drifting Arch. on foot. The spired roof of this tower is constructed from five triangular panels. When a mechanism in the center of the room is activated, the spire unfolds and becomes flush with floor. At this point the observation deck is in the shape of a star and inscribed on each of the points is a name written in ancient Draconic. Each name is one of the five aforementioned structures and following the direction in which it points will lead you to the corresponding location.

Under the ground resides a extensive complex of halls and stairs leading deep into the earth. The deepest of which outputs into a small antechamber. This room hangs from a cave roof within the Underdark and has a mechanism similar to it's aboveground counterpart. This one differs because the spire in fixed to the underside of the floor and points downwards.

Amongst the towers, halls, and shafts is a hidden chamber which holds an artifact only known as the Twin Heart.

History
The Heart was the last thing created by the Twins, almost 50,000 years ago. It's creation acted as a catalyst, activating the Barrier. Furthermore, in their final moments they hid their still beating hearts somewhere deep in the castle, hopping the barrier would serve as sufficient protection.