Kingdoms in Death
Your knowledge of vampires has given you the extraordinary ability to detect subtle signs of their presence and to resist their dominating ability.
Prerequisite: Knowledge(religion) 6 ranks.
Benefit: You can take a move action to unfailingly determine whether a vampire or vampire spawn is within 30 feet of you.
In addition, you are immune to the dominate ability of vampires and vampire spawn.
Rulebook: Libris Mortis (p. 31)
Edition: Supplementals (3.5)