Primalist / Rageshaper

[NikolaiJuno]

Does Bestial Aspect from Rageshaper effect natural attack gained through rage powers granted by Primalist?

[Captain Zoom]

I assume you are talking about Bestial Aspect? No, the ability from Bestial Aspect does NOT work with natural attacks gained through Rage Powers. Bestial Aspect specifically states that it works with natural attacks gained through polymorph spells:

"At 4th level, whenever a rageshaper gains a natural attack through the use of a polymorph spell, he can ..."

[Klarth]

Bestial Aspect
"...If the rageshaper's bloodrage powers already grant natural attacks or alternate modes of movement, then the bonuses granted by bestial aspect also apply to these bloodrage powers."

That said, by RAW it only works for bloodrage powers not rage powers, as there's nothing in the Primalist that says rage powers count as bloodrager powers.

[NikolaiJuno]

Primal Choices: At 4th level and every 4 levels thereafter, a primalist can choose to take either his bloodline power or two barbarian rage powers. If the primalist chooses rage powers, those rage powers can be used in conjunction with his bloodrage, and his bloodrager level acts as his barbarian level when determining the effect of those bloodrage powers and any prerequisites. Any other prerequisites for a rage power must be met before a primalist can choose it. This ability does not count as the rage power class feature for determining feat prerequisites and other requirements.

This ability alters the bloodline class feature.

It alters the bloodline feature, does that not mean that the rage powers are part of the bloodline feature?

[Calth]

They are part of the bloodline, but still not bloodrage powers.