This spell allows you to conjure a powerful aura of chaos around you, which damages foes who utilize melee combat against you. However, it is not available for everybody, as it requires your blade to deal some other than physical damage and your blade needs to be fed with sufficient amount of life energy. The aura doesn't stay up for free, though. It requires a constant upkeep to maintain it. You can dispel your aura by command 'dismiss aura'.