Items / Dust of Appearance
Dust of Appearance costs 80 gold in Dota 2 patch 7.41f.
For 12 seconds, creates an area that reveals and slows invisible heroes by -20% in a 1050 radius where the caster was standing. Invisible units revealed by dust take 25 damage. The debuff effect on enemies lingers for 8s after leaving the area of effect.
Places a debuff on enemy units in the area that reveals them when they are invisible.
One may hide visage, but never volume.