Liquid Form
Transmutation [Silt/Water]
Level: Silt 2, Water 2, Wiz 2
Components: S, M/DF
Casting Time: 1 standard action
Range: Touch
Target: Willing corporeal creature touched
Duration: 2 minutes/level
Saving Throw: None
Spell Resistance: No
The subject and all his gear becomes a pool of silt or water. The subject gains damage resistance 20/magic. His material armor becomes worthless, though his size, Dexterity, deflection bonuses, and armor bonuses from force armor still apply. He becomes immune to poison, disease, nausea, sickness, and critical hits. He can not attack or use spells with verbal, somatic, material, or focus components while in liquid form. The target loses supernatural abilities while in liquid form.
The liquid creature cannot run but may flow (speed 10). He can pass through small holes, or narrow openings, even mere cracks, with all he was wearing or holding in his hands, as log as the spell persists. He does not need to breathe while in this form, but he is subject to currents if he enters the medium into which he has changed. The swim skill does not nelp a creature in this form, the speed of the current is subtracted from his own speed when moving against it. For instance, if the creature enters a lake with a current speed of 5, he could travel against the current at speed 5.
A creature in this state is vulnerable to control tides. The lower tide version of the spell acts as a slow spell and may force the creature down a crack in the floor. The raise tide variant could prevent the creature from slipping escaping down a crack in the floor. For either version the creature gets a Will save to negate.
Arcane material components: A vial of the pure liquid into which the target is to be transformed or the ichor of a mephit aligned to that liquid.
This is 3.0 style DR. It should be 20/magic. And that seems a little high
"His material armor becomes worthless, though his size, Dexterity, deflection bonuses, and armor bonuses from force armor still apply."
Better to say "He loses his armor bonus to AC, though his size..."
"He becomes immune to poison and critical hits. "
Poison, but not disease?
"He is subject to currents if he enters the medium into which he has changed."
What does this mean? Does he need to make swim checks? It brings up another question: is he subject to suffocation, or can he breath his element while in this form? What about damage from the element, if he's magma for instance?
"When cast as a magma spell, the creature ignites any flammable materials he contacts."
You ought to either have additional minor effects for each of the other ways the spell can be cast, or it needs to be a higher level magma spell. You can't have additional effects as one type of spell and not as others and have them all be the same level.
"A creature in this state is vulnerable to control tides."
Again what exactly does this mean?
In retrospect, a liquid form is more limitted than a gaseous one. Therefore, I reduced the level of liquid form to Lvl 2.
I then created a second spell for the magma form. The magma form has some additional effects and so I raised its level to that of gaseous form.
Not being sarcastic.
I just know that if this spell were to be introduced in to my group a certian half-giant would try this on our halfling water priestess.
It causes most living creatures to vomit.
The liquid form is too viscous to drink.
The caster would reform inside of the drinker's when the duration expired. Use normal rules for being swallowed whole.