User blog comment:Elphrihaim/Clarivoyance...?/@comment-3475363-20130808122442

Maybe this is a nice upgrade for Clairvoyance. It has a similar appearance to Singed's Poison Trail.

'''Enemies active and upon entering the Clairvoyance area are afflicted by the Trail debuff for 3 seconds. The Trail debuff leaves a trail behind, showing the way the enemy champion(s) has walked to. The trail last 3.25 seconds.'''