Signet of Midnight

Acquisition
Signet of Capture:
 * Malus Phasmatis (Perdition Rock)

Usage
This skill is much more useful defensively than offensively. Due to its touch range, it is rarely a good idea to plunge headlong into the fray with your fragile Mesmer's armor with the intent to blind your target, but it can be a complete lifesaver if a melee user (be it an enemy Warrior or a Bladed Aatxe) decides to feast on your squishy flesh.

For Mesmer/Necromancers or Necromancer/Mesmers, the fact that this skill blinds you as well can be used to your advantage if combined with skills which transfer conditions, such as Plague Touch or Plague Sending.