[Magikeeper]

So, I thought of some more ideas for stomach. I also made some edits to the current suggestions:

Spoiler

Stomach: Cost - 10
Appearance: Stomachs appear as fleshy sacs inside the Ozodrin,
Required Level: 14
Benefits: Stomachs can be useful tools to an Ozodrin who likes eating things(or people). Any mouth can lead to any stomach, chosen when the mouth is created. A stomach has all the benefits described in Swallow Whole. You have one stomach automatically, which cannot be removed or sold for form points. Anything in a stomach that is removed is either pushed through an opening or is placed in a square next to the Ozodrin. You may apply or remove augments to a stomach after it has been created as a move action.
Augments:

Stomach of Steel: Additional cost 3
The hardness of this stomach is increased by 5. You can add this augment multiple times to the same stomach.

Resistant Innards: Additional cost 3
The walls of your stomach gain energy resistance 10 to the energy type of your choice. You can add this augment multiple times to the same stomach. Its effects stack.

Dimensional Trap: Additional cost 4
Teleportation effects do not function within the stomach. This includes plane shift and similar effects.

Membranous Construction: Additional cost 1
Required Level 15: You can create an object in your stomach. This augment functions like wall of stone, except that the object is made out of your flesh instead of stone, fuses with surrounding flesh, and only creates 5 cubic feet worth of material. This flesh has the same hardness and energy resistances as the rest of the stomach. This augment can be added to the same stomach multiple times.
Might not work now that I know how stomach size works

Sticky Stomach: Additional cost 5
Required Level 16: Flight spells do not work inside your stomach. Additionally, creatures that come into contact with your stomach walls, floor, or ceiling must succeed on a DC 10 + ½ your class level + your charisma modifier strength check or else be entangled for 1 round per Sticky Stomach augment applied to the same stomach. The DC to climb out of your throat increases by 10. This augment can be added to the same stomach multiple times.

Warped Stomach: Additional cost 5
Required Level 17: Your stomach can be of any shape or size provided that its volume remains the same. This augment cannot be applied to a preexisting stomach. If a creature would not be able to fit inside your stomach, the walls slightly expand around it. A creature in such a stomach can only use a light slashing or piercing weapon to cut its way out.
Might not work now that I know how stomach size works

Massive Stomach: Additional cost 5
Required Level 17: The volume of your stomach increases by 100% of its original size. This augment can be applied multiple times, but it cannot be applied to a preexisting stomach.

Digesting Liquid: Additional cost 3
Required Level 18: All creatures and objects inside your stomach take 5 points of either acid, cold, fire, or electricity damage – chosen when you add this augment. A creature may make a reflex save against a DC of 10 + ½ your class level + your charisma modifier to take half damage. You may apply this augment to the same stomach multiple times, each creature only makes one saving throw per energy type (for example, if you applied this augment twice to deal 10 fire damage each creature would only make one saving throw in an attempt to take 5 damage instead).

Inner Universe: Additional cost 10
Required Level 19: You may apply any one elemental or Magic planar trait to the stomach except for the enhanced magic trait. This trait does not effect you, but it does effect any other creatures in your stomach. It costs an additional 20 form points to apply the major positive, major negative, limited magic, or dead magic planar traits. You may apply this augment to the same stomach multiple times, but only once for each kind of trait (Elemental and Magical).

Monster Within: Additional cost 10
Required Level 20: The walls of your stomach function as though they were a mirror of opposition. You may choose to suppress or resume this ability as a free action, although you have no control over any created duplicates. The duplicate ceases to exist if either they or the original leave the stomach. This augment functions any number of times per day, but only one duplicate can be in existence at a time for any given opponent.

Heh, I didn’t even intend for there to be 10 augments…