Arcane Striker (Su)
Source: Ultimate Intrigue, p. 61
The warlock gains Arcane Strike as a bonus feat. At 12th level, when she activates Arcane Strike, she can choose to also give her weapons the flaming, frost, shock, or thundering weapon special ability. She makes this choice each time she activates Arcane Strike, and it lasts for the same duration. At 16th level, she adds anarchic, axiomatic, flaming burst, holy, icy burst, shocking burst, and unholy to the list of special abilities she can select. She can choose to apply an alignment-based weapon special ability only while in her vigilante identity, and only if it matches the alignment of her vigilante identity.