Lazarus Pits

"There are waters in Nanda Parbat. They've permitted Ra's to live for over a hundred years. And in rare instances, told in legend, those waters have been used to restore the dead to life."

- Malcolm Merlyn

The Lazarus Pit, historically known as the Fountain of Youth, is a pool of regenerative water that allows the user to heal themselves of any wounds, or even prevent aging to a certain extent. The only known such pool is owned by Ra's al Ghul, located within his chamber in Nanda Parbat. Despite keeping a person appearing youthful, they are known to lose their potency after a number of centuries and begin to weaken their effects.

History
The pit was once found by al-Khidr, who wrote about it in the religious text, the Quran. Later in history, in the 5th century BC, the historian Herodotus first wrote about the fountain, the first of many to do so. Nineteen centuries later, the Spanish explorer Juan Ponce de León went in search of the fountain, but to no avail.

As of 1854, Ra's al Ghul had become the leader of the League of Assassins and had begun using the fountain in order to maintain longevity.

In late 2014, Nyssa arrived back to inform her father of Malcolm Merlyn's being alive. As she arrived, he stepped out of the fountain from bathing and was clothed.

The following year, after Oliver Queen survived Ra's' stabbing him, he took him to the Lazarus Pit to explain what would be in store for him if he took his place as Ra's al Ghul. Later, after Ra's cut himself on Nyssa's blade, he healed the wound in the pool.

After being stabbed by Ra's, Thea was taken to the hospital by Oliver, where the doctors were unable to restore her back to normal health as she was put on life support. Malcolm and Oliver agreed to take Thea to Nanda Parbat, where she was healed in a ceremony with the Pit. Upon being submerged in the water, she gained temporary enhanced strength and agility, as well as animalistic aggression. The second she woke under the water, she tore away the ropes on her hands and feet and out of the hands of Diggle, Maseo, Oliver, and Malcolm, with inhuman ease and speed. She angrily screamed as she leaped at least 30 feet from the bottom of the pit and kicked Oliver down. She then proceeded to land on the floor in a cat-like manner and pounce on Oliver, only to be pulled off by the League members present, as she had seemingly lost her enhanced abilities upon leaving the water, though not her mindless agression, and was injected with a sedative that neutralized her.

Abilities
The Lazarus Pit has the ability to delay a person's aging and enables them to live at least 150 years. It can also bring a person back from death. However, there is a side effect from this. The revived person becomes disorientated, aggressive, and have their memories mixed up for a short period of time before returning to normal. Thea for example, thought Malcolm was the one who raised her her entire life since he's her biological father rather than Robert Queen, having mixed the memories of Robert and knowledge of Malcolm being her real father. The user can also becomes overwhelmed with mindless agression and gains increased strength for a brief period. The user could had enhanced jumping abilities, allowing them to jump 30 feet in the air from the bottom of a deep pool, though this is also temporary.