>>513799478
Indra (Perkwunos) defeats Vritra, the great dragon, by striking him with the Vajra. The Vajra is represented by the thunderbolt and it brings transformative change, the Vajra is also a symbol of polar unity, symbolized by the sun and moon disc. Vritra is the reptilian brain, and before Indra defeats him, he was swallowed by him. Dark night of the soul.
The Vajra represents the same thing that the Ankh does, and Vritra is Typhon. Typhon swallows the soul and forces them into rebirth.
Now the Vajra is used in Vajrayana to represent enlightenment and a balance of the polarities within us all. When one reaches this stage, the others there regard them as the Dharmakaya in the flesh (the Dharmakaya is Akasha). They are called Mahasiddhas at this point and are known for psychic abilities, such as the Five Eyes.
The Crann Bethadh is the Celtic tree of life and was called a "portal to the world of Faeries". This is just the tree of life and through the process represented by the tree of life one acquires the Divine Eye (one of the Five Eyes) and can see things others can't, such as spirits.