Can Greater Metamorphosis or Assume Supernatural Ability be used to acquire supernatural class features??

Question

The ability to change into various forms using Greater Metamorphosis includes the assumption that when there are more than one creature of a particular race, they do NOT count as a unique individuals for the purpose of the power, or at least their collective average does not count. This also seems to apply to subtypes of a given race which are also valid targets.

It also allows one to gain all extraordinary and Supernatural special attacks and qualities of the creature.

Should there be a number of creatures that have a given base and/or prestige class, would that count both as non-unique and as an effective subtype of said race, or in any case making suoernatural class features (listed in the Special Attacks or Special Qualities in NPC start blocks) a valid target for Greater Metamorphosis and/or Assume Supernatural Ability?

Answer 1

Creatures with class levels are unique

Greater Metamorphosis says:

As metamorphosis, except that this power enables you to assume the form of any single nonunique object or creature (of any type)

Assume Supernatural Ability says:

You learn to use a single supernatural ability of another kind of creature while assuming its form

So, is an improved monster that has class levels still a generic type or kind of monster, or is it unique? The rules for Improving Monsters say:

Each of the monster entries describes a typical creature of its kind. However, there are several methods by which extraordinary or unique monsters can be created using a typical creature as the foundation: by adding character classes, increasing a monster’s Hit Dice, or by adding a template to a monster.

So, class levels (or templates, which are explictly exempt from Metamorphosis) turn a typical creature of its type into an extraordinary or unique creature. It is not a typcial creature any more, it is unique, an individual creature. Greater Metamorphosis or Assume Supernatural Ability do not apply to it or its expanded Supernatural Abilities.