L'unica classe che mi vien in mente è uno psion del tipo shaper/metacreativo.
L'eidolon personalizzabile e potenziabile con le sue opzioni lo fai col potere dell'astral construct.
srd ha scritto:An astral construct generally appears as an animate clump of ectoplasm with a vaguely humanoid shape, but the manifester can mold or sculpt one according to his or her whim within the limits imposed by the creature’s size. The quality of such “construct sculpture” is determined by a Craft (sculpting) check. A result of 10 to 19 creates a creature that is recognizably similar to the desired creature shape; a result of 20 to 29 creates a construct that looks like an accurate portrayal of that creature type; a result of 30 or higher creates a construct that looks like a specific individual. No matter how high the Craft (sculpting) check result, though, an astral construct’s appearance can’t hide the otherworldly material from which it is formed.
Però il risultato non è uguale preciso all'eidolon di Path, e così al volo non so se ci sia qualcosa per simulare la fusione con l'eidolon dell'archetipo del sintetista.