Interloper's Hatred (4e Feat)
From D&D Wiki
Interloper's Hatred [Racial]
Bonus to attacks against immortals, gain radiant resistance
Benefit: You gain a +1 bonus to attack rolls against Immortal creatures. In addition, you gain resist 5 to radiant damage.
Special: At 11th level, the resistance to radiant increases to 10 and the bonus to attack rolls increases to +2. At 21st level, they increase to 15 and +3, respectively.