Fortify Familiar

(Tome and Blood: A Guidebook to Wizards and Sorcerers, DnD 3.0)

Universal

Level: ; Sorcerer/Wizard 4
Components: V, S
Casting Time: 1 action
Range: Touch
Target: Your familiar
Duration: 1 hour/level
Saving Throw: None (harmless)
Spell Resistance: Yes

You make your familiar tougher.
While the spell lasts, it gains a +2 enhancement modifier to natural armor and has a 25% chance to avoid extra damage from sneak attacks or critical hits (though the attack still deals normal damage).
The familiar also receives 2d8 temporary hit points.