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Ok, essentially I am creating a magic item that is a ring of sustenance that also has endure elements and breath without air. What I am having issues with is the spell for breath without air. I want it to be like the Iridescent Ioun Stone. Anyone got any idea on a spell that would make it work? The ones I have already are:

Create food and water - Used in ring of sustenance
Endure Elements

So I was thinking about whenever Mythic(Epic) comes out that there should be some new evolutions for summoners. So id did some work and came up with this add on to the Large size.

If 8 additional evolution points are spent (on top of the 6 for Huge), the eidolon instead becomes Gargantuan. The eidolon gains a +24 bonus to Strength, a +12 bonus to Constitution, and a +7 bonus to its natural armor. It takes a –6 penalty to its Dexterity. This size change also give the creature a –3 size penalty to its AC and attack rolls, a +3 bonus to its CMB and CMD, 15-foot reach, a –6 penalty on Fly skill checks, and a –12 penalty on Stealth skill checks. If the eidolon has the biped base
form, its reach increases to 20 feet. Any reach evolutions the eidolon possesses are added to this total. These bonuses and penalties replace, and do not stack with, those gained from becoming Large or Huge. The summoner must be at least 21st level before selecting this option.

Ok so I have a creature with 12 HD. Do I add his CON mod to his hit points.

Ok so I have a creature with 12 HD. Do I add his CON mod to his hit points.

Ok, I have a four armed Eidolon who cares two greatswords. He has two-weapon fighting and is proficient with the swords. On hand on each side of his body is a primary hand. Would there be any penalties or would it be like a normal person carrying one great sword. Right now we are giving him a -2 for both swords just because we are not sure.