1 HD: You are immune to the "red" effect of a prismatic spell. After being struck with this effect you have fire immunity for 1 round. 3 HD: You are immune to the "orange" effect of a prismatic spell. After being struck with this effect you have acid immunity for 1 round. 6 HD: You are immune to the "yellow" effect of a prismatic spell. After being struck with this effect you have electrical immunity for 1 round. 12 HD: You are immune to the "blue" effect of a prismatic spell. After being struck with this effect you have damage reduction 10/adamantine for 1 round.