Undead involves some situations of the Druid Order, so the situation of the Druid Order is explained, and the abilities of the Druids in the text are also set.

The Druids are the guardians of nature, and there is no conclusive opinion as to whether they are or not, and the rituals and teachings of the Druids are very mysterious, and they are only orally taught according to convention. Therefore, although historians have studied and explored over the ages, little is still known, and most of the information about them is from ancient Greek and Roman sources. In addition, archaeologists can only stumble upon small clues such as drawings and signs from the remains of forests, shrines, and temples. The earliest records of the Druidic Church in the history books are found in the writings of Julius Caesar and the greatest historian of ancient Rome, Tacitus. During Caesar's expedition to Gaul, he reported to the Senate: "The Druidic priest had important positions and powers such as arbitration and celebrancy in the locality, and the priest was proficient in physics and chemistry, and they lived in the woods, cut down sacred acorns with golden sickles, and even sacrificed human beings!" In fact, in most cases, the Druids were recognized as the guardians of ancient intelligence, with high moral cultivation, and a deep knowledge of natural science and theology.

According to the records of the ancient Romans, the Druid priests were proficient in divination, and in the process of prophecy, the Druid priests often used birds and beasts, such as crows and eagles, to divinate good fortune and evil. Prophecies were sometimes made by observing the throats and entrails of animals (living people used for sacrifice). On the occasion of the festival, the Druid priests perform rituals to hypnotize people, then exchange souls, and predict the future through dreams. Druids also believe in the eternity of the soul. They will burn all the belongings of the deceased after the death of their loved ones, and even jump into the fire to hold the bodies of their loved ones in order to ascend to bliss with their loved ones. They would write letters to the deceased and even raise the amount of the payment so that the other person could pay it back after death. Druidism stipulates that both men and women can be Druids, and they also enjoy a high status in society, they are synonymous with law enforcers, bards, and explorers. Historians have equated druidic priests with Indian Brahmins, Persian monks, Egyptian shamans, and witch doctors.

Around the 1st century AD, the Roman Empire went on a major crusade against the Celts. The Celts were a barbarian people who lived in Gaul, Britain, Ireland, Europe, Asia Minor, and the Balkans from the 5th century BC to the 1st century AD, and the Druidic priests were high-ranking Celtic priests, mages, or prophets. Tacitus recorded that during the battle, Druids dressed in black leaped through the Celtic army, roaring the names of the gods and cursing the Roman Empire. After the victory of Rome, he not only slaughtered all the Celtic soldiers, but also bloodicured the Druids, and abandoned the corpses of the priests in the sacred forest of the Druids. This battle brought the Druidism to a crumble for centuries to come, and until the sixteenth and seventeenth centuries A.D., the Druids existed only as a perishing cult and a good guardian of nature.

In 1717, William Stuckley and John Tolan, known as the Druid High Priests, re-established the Druids, and Henry Holly restored its ancient dogma, making it a Freemason-like charity. In 1963, the Reformed Druid Order of North America was founded, but the Order was founded only by a group of college students at Coreton College in Northfield in Minnesota who opposed the school's forced students to participate in religious services. Later, the organization developed into a Druid order that promoted neo-pagan beliefs.

The strength levels of the undead Druid Order from low to high are: Transformation Druid, Totem Druid, Vengeance Druid, Destruction Druid, Order Druid, and Chaos Druid.

Transforming Druids are the most basic combat druids, with a higher status than ordinary clerics, and they can transform into bears or werewolves.

The Totem Druid gains the ability to summon on top of the ability of the Transfiguring Druid, which is able to summon divine creatures, such as the Divine Bear, the Divine Lion, etc.

Vengeful druids have strong combat abilities, in addition to having various abilities of totem druids, they can use a lot of attack magic, such as lightning, lightning explosion, etc.

The Druids of Destruction are the backbone of the entire Druid Order, and they have extremely strong attack abilities and can use some intermediate natural magic.

The Order Druids are the senior management of the Rui Order, they are proficient in natural magic, and their strength is terrifying, and there are a total of twelve Order Druids in the entire Druid Order, ranking from first to twelfth, in order of first order.

The Chaos Druid is the supreme leader of the entire Druid Order, and his strength is unfathomable, and he is an existence that can compete with the Pope.

In addition, the druids have a series of other systems of priests, which will be explained later in this article.