Cleon
Legend
Okay, let's get started!
Might as well go through them in order, so the CR 1 Pine Kindred will be first.
AC 12 is too low. The original monster had Armour Class: 5, which is equivalent to chainmail. It's not mentioned that they wear armor and the WD21 illustration doesn't show any armor or shields, so I'm thinking a combination of dexterity and bark-like hide accounts for it.
An AD&D Bugbear also has AC 5, while a 5E Bugbear has AC 16 (hide armor, shield).
Contrariwise:
An Orc has a slightly inferior AC 6 in AD&D and AC 13 (hide armor) in 5E.
A standard Ghoul also has AC 6 in AD&D and AC 12 in 5E (from Dex alone apparently, they have AC 14 in 3E).
So I'm thinking:
Armor Class 15 (natural armor)
Might as well go through them in order, so the CR 1 Pine Kindred will be first.
AC 12 is too low. The original monster had Armour Class: 5, which is equivalent to chainmail. It's not mentioned that they wear armor and the WD21 illustration doesn't show any armor or shields, so I'm thinking a combination of dexterity and bark-like hide accounts for it.
An AD&D Bugbear also has AC 5, while a 5E Bugbear has AC 16 (hide armor, shield).
Contrariwise:
An Orc has a slightly inferior AC 6 in AD&D and AC 13 (hide armor) in 5E.
A standard Ghoul also has AC 6 in AD&D and AC 12 in 5E (from Dex alone apparently, they have AC 14 in 3E).
So I'm thinking:
Armor Class 15 (natural armor)