A Planetwide lunar eclipse occurs every 600-700 years, during which time the son of Satan will be born through a mortal vessel. This event will be followed by a solar eclipse 6 days later. During the interim, this individual called the Warlock (https://vignette.wikia.nocookie.net must summon his father from his hellish prison into the mortal realm before the solar eclipse. The devil can then walk the earth to conquer and destroy it. The only way to prevent this are six magical rune stones that create light to vanquish the darkness. These stones are in the possession of an ancient organization of Druids tasked with protecting the world. The rune stones are used in a ritual during the birth of the warlock, excorsicing the demon back to hell.
The problem is that the Catholic Church regard this organization as a pagan cult, and their members as practicioners of witchcraft. The church seeks to wipe them out and exterminate their history, and has obligated all of their allies in the Holy Roman Empire to hunt them down. In lite of this, the Druids must find a way to conceal themselves from their enemies to protect the rune stones in order for them to assemble when the time is right. There are, however, a number of problems with there options.
If the organization stays together, they can keep themselves and the stones in a relatively close vicinity and can assemble easily when needed. However, it makes them easy pickings if they are located by the wrong people. This makes them vulnerable to being wiped out all at once. If they diverse themselves across the world, they become harder to exterminate completely. If one sect is killed, they will have no information on where others are located, allowing the majority to survive. However, this can lead to the Druids being a forgotten order as centuries pass. The stones can become lost to time as they remsin scattered. This is a period without smartphones and email. Without any efficient way to communicate with each other, sects can simply fade into history.
How can the Druids remain safe while hiding the runes to fulfill their task?