You are far more resilient to powerful magic than outward appearances might suggest. This technique was first handed down by disciples of the dragons of Meier, who share this heightened ability to withstand some types of magic.
Prerequisite: Con 13.
Benefit: You are treated as 2 higher than your actual hit dice for the the purposes of how spells, spell-like abilities, and supernatural powers of enemy creatures affect you. For example, a daze spell would not affect a 3rd-level character with this feat, because she would count as having 5 HD for the purposes of that spell.