He reviewed the book so I don't have to

Over the years, there have been several reviews of what may be druidry's answer to Plan 9 From Outer Space, 21 Lessons of Merlyn by Douglas Monroe. Ceisiwr Serith wrote what has to be the most thorough one anyone should dare essay. With page numbers provided for every error Serith chose to acknowledge (trust me, there are others), anything I'd have to say would be redundant.

Samples to whet your appetite:

"To those with an interest or fascination in THE MATTER OF BRITIAN: [his caps] Arthurian Lore (fact or fantasy), Druidism and the mysticism of Merlyn -- this book is a 'first of a kind.' Now aren't we just special.

The "3 Keys of Druidic Mastery" are "To know, to dare, to keep silent." Gee, all those ceremonial magicians got it wrong; they included "to will."

And one last point that's really close to my heart, just to close this out:

"Llyyr ab Manannan" I don't know if the Welsh is right, but I do know that "Manannan" was an Irish god, whose Welsh cognate was "Manawydan," and that he was the son of Lir, not the other way round.