
Cubed |

Is the increase in natural armor an ability increase? The question was asked here but not answered.
For the Agathiel Vigilante (Spymaster's Handbook p. 25)
Agathiel:
Beginning at 4th level, when an agathiel assumes his vigilante identity, he physically transforms into an animal,
though he always retains unusual traits that set him apart from ordinary animals, as if using beast shape I, except the vigilante gains no ability adjustments and can select only a single animal ability from those listed in the spell’s description. His social identity remains his true form, and unlike with beast shape I, an agathiel can remain in his animal form indefinitely. The agathiel’s vigilante identity is considered a polymorph effect
though he always retains unusual traits that set him apart from ordinary animals, as if using beast shape I, except the vigilante gains no ability adjustments and can select only a single animal ability from those listed in the spell’s description. His social identity remains his true form, and unlike with beast shape I, an agathiel can remain in his animal form indefinitely. The agathiel’s vigilante identity is considered a polymorph effect
Beast Shape I:
(CRB p. 247)
When you cast this spell, you can assume the form of any Small or
Medium creature of the animal type. If the form you assume has
any of the following abilities, you gain the listed ability: climb 30 feet, fly 30 feet (average maneuverability), swim 30 feet, darkvision 60 feet, low-light vision, and scent.
Small animal: If the form you take is that of a Small animal, you
gain a +2 size bonus to your Dexterity and a +1 natural armor bonus.
Medium animal: If the form you take is that of a Medium animal, you
gain a +2 size bonus to your Strength and a +2 natural armor bonus.
(CRB p. 247)
When you cast this spell, you can assume the form of any Small or
Medium creature of the animal type. If the form you assume has
any of the following abilities, you gain the listed ability: climb 30 feet, fly 30 feet (average maneuverability), swim 30 feet, darkvision 60 feet, low-light vision, and scent.
Small animal: If the form you take is that of a Small animal, you
gain a +2 size bonus to your Dexterity and a +1 natural armor bonus.
Medium animal: If the form you take is that of a Medium animal, you
gain a +2 size bonus to your Strength and a +2 natural armor bonus.