So, I made myself a mutagen warrior and just got the tentacle discovery at level 7, mostly for the roleplaying fun of it. Nevertheless, the rules text was a little vague, and so I decided to look up errata and discussion. I am now very confused.
To whit:
1) Am I correct when I believe that this "special" tentacle cannot be used in conjunction with weapon attacks at all, but that I can full attack with just the tentacle if I wish?
2) If yes, when i attack with the tentacle, is it secondary or primary with regards to attack/damage bonus and power attack? It is, after all, my only natural attack, even though it is a tentacle. Rules as written seem to indicate primary with 1.5x str to damage, overriding the table for "common natural attacks".
As a gm I would probably not allow a measly arm-length tentacle to rival a two-handed weapon in damage output. However, making the attack secondary seems rather harsh when it has to stand alone. Personally, I would say primary attack with normal damage for a one-handed weapon. Thoughts?