Druidic Transformation (EAFW)

When a druid has made the decision to metamorphosize into an advanced being, and has advanced to the 20th level both as a priest and as a psionicist, he continues to gain experience throughout the 20th level. Upon reaching 3,000,000 experience points, the total is reduced to zero and he becomes a 21st-level spirit initiate.
A druid does not actually become a spirit of the land, rather, he is melded into one. Most of these spirits are the repositories of thousands of years of human experience and wisdom.
* Prerequisites. Only human druids who have psionic abilities and Wisdom and Constitution scores of at least 15 can transform into elemental beings.
* Transformation. As a druid advances to the 30th level, he slowly takes on the physical and mental characteristics of his guarded lands. This is known as melding, and can take years to complete. The druid gains certain characteristics as he transmogrifies, as well as those powers granted by his level.As the transformation begins to take place, the druid starts taking on the characteristics of his guarded lands. The following table summarizes the effects of druidic transformation:
 Druidic Transformation Levels Table
Level	Elemental	AC	HD (d8)
21 	0 	0 	+2
22 	300,000 	-1	+2
23 	600,000 	-1	+2
24 	1,000,000	-2	+3
25 	1,500,000	-2	+3
26 	2,000,000	-3	+3
27 	2,750,000	-3	+4
28 	3,500,000	-4	+4
29 	4,250,000	-4	+4
30 	6,000,000	-5	+5
: Hezzerat became a legend long ago. Now, as the ancient druid began to look deeper into the nature of his lands, he felt a compelling urge to become one with them. Me spoke with the spirit that dwelled in the canyon Me guarded, and learned that it was composed of a great many of his own, powerful predecessors.
: His magical transformation took years to accomplish. It started with rugged, ruddy features, which resembled the valleys that ran through his lands. A year later, his skin grew as hard as the stones of his boulder fields. Three more years passed, and he was as hardy as an oak and three time as tough. And then finally, the ancient druid grew powerful enough to merge with his lands, and a new protector was born.
: — Hezzerat's Transformation
Like the clerical transformation to an elemental being, the druid's assimilation into his guarded lands is irreversible.