The Horseman's Horrific Hood

The Horseman's Horrific Hood is an plate head armor. Its stats scale to your level when acquired.

This is the Headless Horseman's head gear. It has a natural fiery green armor glow.

Source
Can be found inside Loot-Filled Pumpkin after defeating the Headless Horseman during the Hallow's End seasonal event.

Macro Fun
A fun Macro that makes use of the "USE" function of the helm. Right-click to equip (if needed) and left-click to activate.

/equip [btn:2] The Horseman's Horrific Hood /stopmacro [btn:2] /y Haa ha ha ha ha ha ha ha haaaa! /use The Horseman's Horrific Helm
 * 1) showtooltip The Horseman's Horrific Hood