Lolth's Boon( Drow of the Underdark, p. 54)
You can channel negative energy to empower vermin.
drow or Lolth patron deity, Rebuke undead,
You can spend two rebuke undead attempts as a standard action to unleash a 60-foot-radius burst of divine energy. Each vermin in the area gains temporary hit points equal to its HD, as well as a +2 profane bonus on melee damage rolls. These effects last for 5 rounds.