Incendax74's page

If you want to argue 'arms' aren't limbs that is fine by me, the rule book now states you must have limbs to cast a spell, the errata makes that the case. The FAQ further clarifies that those limbs need to be arms. They haven't taken down or sticken the FAQ from use two years later even after errata, it still stands as the 'official' opinion on the subject.

I'm not saying that 'arms' aren't limbs. They are limbs, and so are legs. There is also no logical reason for them to issue Errata on a subject that would require further clarification from a prior document almost two years older. If the Errata intended it to be limited to arms, it would say arms instead.

Errata and FAQ are theorycrafting in your opinion? Errata and FAQs are not mutually exclusive, errata is something that changes the rulebook and typically limited in what can be changed due to word count and layout changes to the book. FAQs are actual clarifications to the rules so we have the design intent when ambiguous wording is used in the book/rules.

First you think I was arguing that arms are not limbs, and now you think I believe Errata and FAQ are theorycrafting? With all due respect, I do not think you have a firm grasp of my position.

Thanks for your opinion on the subject, I guess. They are both 'official' and there has been nothing stated that invalidates the FAQ or that it should be ignored. Errata means changes to the pre existing books that has been made to new prints. The FAQ still stands regardless of the 'age' difference.

There has absolutely been something stated that invalidates the FAQ. They say limbs. If they meant arms, they would say arms. Anything further is just theorycraft on your part. We can still refer to the FAQ in places where the updated Errata does not overrule it.

There is both an errata and FAQ regarding this. One says you need limbs, the other says you need arms. Neither contradicts the other, you need limbs, which need to be arms, to cast a spell.

Nope. The Errata is almost two years more up to date than the FAQ. If it meant Arms, it would say Arms. Do you have limbs? If yes, then you can cast spells.

The synth and the eidolon are one creature, there are no separate actions. The synth is encased in the eidolon and uses its 'body' for intent and purposes. How you want to fluff it, it doesn't really matter as long as the rules are enforced (IE cannot cast without having arms to do so, etc).

You don't need arms to cast spells, just limbs. So Biped and Quadraped can cast spells, but Serpentine and Aquatic cannot.