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'.