Blades of Reason

Source: Codex: Dark Angels, p. 17

As long as the holder of the Blades of Reason is alive at the end of the battle, the Dark Angels player rolls a D6 for each enemy model that was slain; on a roll of a 6, they do not die and are instead captured by the Dark Angels. Each captured prisoner adds +D6 victory points to the Dark Angels' total in scenarios where victory points are being used. The Blades of Reason may not be used against Necrons or Tyranids.