Mage Armor, GreaterSchool: conjuration (creation) [force]
Level: bloodrager 3, psychic 3, sorcerer/wizard 3, summoner/unchained summoner 3, witch 3
Casting Time: 1 round
Components: V, S, F (a miniature adamantine suit of armor worth 2000 gp)
Target: creature touched
Duration: 1 minute/level (D)
Saving Throw: Will negates (harmless); Spell Resistance: no
An invisible but tangible field of force surrounds the subject of a greater mage armor spell, providing a +5 armor bonus to AC, +1 more for every 3 caster levels past 7th (maximum +8 at CL 16).
Unlike mundane armor, greater mage armor entails no armor check penalty, arcane spell failure chance, or speed reduction. Since greater mage armor is made of force, incorporeal creatures can’t bypass it the way they do normal armor.
I tried to make it not completely outclass bracers of armor (hence the +8 cap), and gave it a longer casting time, shorter duration, and an expensive focus compared to the original. It's dispellable compared to bracers, too.