The Threads of Magic

Create ward 1/day when casting a spell of 1st level or higher. Choose a non physical damage type. When casting further spells you can choose a new type. Ward has hit points equal to 2 x caster level + Charisma modifier. When you take damage the ward takes the damage instead. If the ward goes to 0 hit points, it is broken, and you take the remaining damage. If you take damage of the chosen type when the ward is broken it replenishes equal to twice the damage taken, up to its maximum.