First off Id like to say that I am very new to Pathfinder and while I do know how to play D&D I have not had a chance to play it very much. I currently have an Eidolon with Claws x2 (1d6+3 with improved damage), Bite (1d8+4 feat Improved natural attack), and Slam (2d6+3 improved damage).
I have looked over the rules for found here http://www.d20pfsrd.com/bestiary/rules-for-monsters/universal-monster-rules #TOC-Natural-Attacks. And I still am not sure if at any point I can use all 4 of those primary attacks (claws count as 2 I believe) in one 6 second round of combat. The rules on natural attacks are not clear enough for me to convince my DM and other party members that my Eidolon can indeed make those attacks all at once. I believe this due to the multiple places where I've read that you can do that. I have discovered that I may have to take a Full Round Action to do what I am thinking. Which is roll a d20 4 times (one for each attack) and then roll damage on each if they hit.
I simply need to know if this is true, and how exactly this works. I ask because my DM and the other players wont take anything but something crystal clear. Probably because Im new and can't seem to explain myself properly. Thank you for any help you can give me. :)
You can, as far as you meet several conditions.
First, the Eidolon table list the maximum number of attacks per turn, in a given level. It goes from 3, at lvel 1, to 7, at lvel 20.
To be able to bite, claw, and slam, you need 4 arms. 2 of them with the Claw evolution, and 2 of them with the slam evolution.
And yes, you need to make a full round action to attack with all your natural weapons, unless you are a quadruped, have pounce, and you are charging. This is the same for monsters too: normally, a dragon can make a bite while moving, or two claws, a bite, two wing buffets and a tail slap, while inmobile and making a full round.
Also, take in account that some natural weapons are listed as "secondary". That means you have a -5 to the attack roll with that natural weapon. For example, a creature with bite, claws, and tail slap, has -5 with the tail slap, because the tail is a secondary weapon (says so in tail description, in Eidolon rules), unless you pay for "sting" too.
Hope this helps
Thank you so much Gustavo, I printed this out this morning and that was exactly what I needed to convince my DM :D
It turns out he wasn't aware that all creatures with natural attacks can do that, which means that I can now do it... but all the other creatures will too :D so... its going to be a little more difficult. Anyway, thank you again for that awesome response :D