Hex

A Hex is a type of spell that can be cast on an enemy target and debuffs some property of that target, such as their armor level, their energy regeneration or their movement speed while the Hex is in effect. Many hexes are available to Mesmers and Necromancers and a few are available to Elementalists and Monks.

When an ally has a Hex cast on them a purple down arrow will appear on their health bar in the party window. If the player suffers health degeneration as a result of a Hex, then his entire health bar will turn purple and begin to decrease.

There are several skills capable of removing or preventing Hexes:
 * Mesmer
 * Inspired Hex
 * Hex Breaker
 * Shatter Hex
 * Monk
 * Convert Hexes
 * Remove Hex
 * Smite Hex
 * Spell Breaker
 * Ranger
 * Nature's Renewal

Additionally, the Monk enchantment Holy Veil makes hexes take twice as long to cast on the enchanted character.