Jerensi's Bladestorm

(2 items) Adds 129 Weapon and Spell Damage (3 items) Adds 1487 Offensive Penetration (4 items) Adds 1487 Offensive Penetration (5 items) While in combat, casting an ability that leaves an effect on the ground creates a 6 meter Spike Vortex that deals 3855 Physical Damage over 5 seconds to enemies inside it. After 5 seconds, enemies within the Vortex are dealt 1925 Physical Damage over 5 seconds. This effect can occur once every 15 seconds and scales off the higher of your Weapon or Spell Damage.