This skill will remove the enchantment before causing the damage.
Consider using this skill when foes may be protected by Spell Breaker, Obsidian Flesh, or Shadow Form and your team frequently uses spells. It will not be possible to target the foe directly, but a well placed Hex Eater Vortex can remove many enchantments that would otherwise be difficult to remove. In the case of Shadow Form (PvP), a Hex Eater Vortex will often result in a one-hit-kill, because of enchantment removal before damage.
This skill shines in GvG, where melee characters are often hexed and their target enchanted with protections such as Guardian or Spirit Bond.