In order to become a druid priest it is believed that it was necessary for the aspirant to go to either a stone henge or wood henge during the dark of the moon. There, in the center of the henge, in a hole in the ground, he would would find a scroll, upon which was written, in ancient runic symbols, a druidic "mass" which he had to commit to memory by the next full moon. Come the full moon the aspirant would return to the henge where, in the presence of three "olaves", or high priests, he would have to repeat exactly and verbatim the text of the mass written upon the scroll. If he made even the slightest error he was immediately put to death as being unworthy to be a druid priest because he didn't know his "mass from a scroll in the ground".