Tentacular limbs specifically mentions "arms" in the spell description, while saying it applies to your unarmed attacks (and specifically mentions claws benefiting).
Is there a particular reason this spell excludes tails, given that the only way PCs can get a tail attack requires spending an ancestry feat?
Basically, for PFS, why should Iruxi make better use of tentacular limbs than a goblin with Hard Tail, when the latter costs more character creation resources? Both attacks do 1d6 damage, the Iruxi already has them with the Agile and Finesse trait, while Hard Tail has no beneficial traits whatsoever.
Hm, the spell description mentions arms twice. One time in the first flavor sentence but also within the rules text.
I guess it is important because it enables you to deliver touch attacks for which you have to have on hand free.
So, not RAW but I would rule:
- only arms can deliver touch attacks
- I see no reason to disallow tentaculize other natural attack if it makes sense (no bite attacks)
- I would allow to tentaculize a total of 2 limbs/appendages (so tail and one arm)