Quote Originally Posted by Debihuman View Post
"A creature with the augmented subtype usually has the traits of its current type, but the features of its original type." Usually doesn't mean always. You have to follow the template to see how this changes. Note that the Pseudonatural Template adds Con +10 to the base creature. "Abilities: Increase from the base creature as follows: Str +22, Con +10, Dex +10, Wisdom +10, Intelligence at least 3." That to me, indicates that the creature gains Con +10.
That doesn't negate my point, since Con +10 is not a type trait.

Actually, I suspect the lich's Con would become some arbitrary number upon losing the Undead traits (which includes Con -), probably 10, and from there it would go up by 10.