Oak doors were the strongest against evil, then we developed steel. He would continue this journey until the Winter Solstice when he confronts his dark twin, Avagddu. Annwn was considered an astral dimension of Earth. There are three circles through which the soul travels in Druid lore. The first is the Circle of Abred where mankind dwells and good and evil exist in equal measure, where all things seek balance.
Mankind is faced with trials and choices of a material nature.
The second circle is Gwynvyd, a place of justified or reconciled spirits and is the union with god. The third circle is Ceugant where god alone exists. The three circles are also represented as suffering, change and choice or earth, the astral transition plane and the final home of the spirit. The spirit or soul is the eye of god which sees all things in its right form, place and time. During this month the soul is raised to the Gwynvyd to be reminded of its purpose on earth.