Manathereal Template (Montser Template)
Something I have been pondering for a while, but have never implemented yet.
Increase HD die by one factor. D6 to D8, D8 to D10, etc.
All attacks are at a disadvantage unless attuned to hit the manathereal plane (similar to ghost touch weapons).
Natural attacks with appendage (claw/hands) gain +1d8 energy damage
Spells up to level HD / 4 do not affect creature
All other spells are weaker. damage reduce by 1 die or duration reduced, etc.
Increase challenge rating by 4