Stone of Wisdom

The Stone of Wisdom (which went under its false name, the Withering Mourner) is a magical object created by Michael Langdon and would debuted in the upcoming LOTM: Witnesses of Sleepy Hollow Spin-Off - Order of Strawberry.

It is a pink ruby that was connected to the Feast of Apollo performed by Lord Helio, who created it. The stone required the help of Dawn's Early Light made by Selina Strawberry. In Lord Helio's delusional mind, the two tools woykd cleanse the sin of humanity. In addition, the stone can also make numerous humans embracing their inner magic and became magicians serving the Order of Flourish, before Michael and Lord Helio made them into Supreme Croats using the enhanced Croatoan Virus.

In LOTM: Witnesses of Sleepy Hollow - Harvest Saga, the stone played a key role in Lord Helio's plan to recreate the Earth into his utopia filled with no sin alongside the Dawn's Early Light.

Overview
In the Order of Flourish's belief, the Stone of Wisdom, which rumored to be the essence of a Demon King known as the Whitering Mourner, was purified by the power of the Light Lord and would save humanity when the Judgement Day arrived in. The memers of the Order of Flourish believed that the stone have many reincarnations throughout the history, and most recent of its reincarnation was made by their leader 2 centuries after he appeared in the world.

Lady Phyllis Peach, who goes by her human name, Phyllis Pride Parker, knows of the Stone of Wisdom's true nature of being Lord Helio's own creation, and she knew its connection to the Feast of Apollo. She revealed this to Lord Helio when he was chained up after killing Lord Helio's beloved adoptive daughter, Hestia Hawthorn, and releasing the chained rogue Phantom Legion to learn more as she was curious as to the Phantom's objective of starting the Feast of Apollo. This revelation led Lord Helio to not only spare Phyllis his planned execution, but to make her his right-hand woman.

It was later revealed that the soul of Hestia was binded into the Stone of Wisdom and was now in the possession of Helene Hawthorn, Hestia's daughter. Therefore, the soul of Hestia was always there, trying hard in protecting her daughter as much as possible. Only Lord Helio, Helene and Selina Strawberry knew about Hestia's soul inside the Stone of Wisdom, but Phyllis later knew from her alternate counterpart, Arzonia Oscuriad, and then they planned an assasination on Lord Helio alongside Michael, attacking Helene and gaining the Stone of Wisdom for herself. Using the stone of Wisdom, Phyllis and her alternate counterpart merged into one being to take over the Order of Flourish and starting a massive attack.

After escaping the attack from Ichabod after the wizard learned her true nature, the mainstream Phyllis told  that they would fight in a final battle after she had the Philosopher's Stone. Lord Helio told Phyllis that to obtain the Philosopher's Stone, a huge quantity of mana must be gathered to perform the Sabbath without the need of a solar eclipse, thus more Phantoms need to be created by forcing Gates into despair. Phyllis wondered if there was another way, despite Lord Helio's claims.