Quote Originally Posted by Deadly View Post
Aura does seem fitting, I suppose, except that it seems to assume it is the entire body that causes the effect.

Making them extra arms will be insanely expensive too, and will force me to fix their number of tentacles. Unless I can count them all as one extra arm. I'd rather have it be a vague "bunch" of tentacles.
The other option is to fluff them as 'legs' (they are limbs after all) which can get you large bunches for the same cost, but has some goofy rules for aquatic
creatures.