Evade

Evasion allow characters to avoid being struck by most attacks. It was only accessible through certain skills. The evasion mechanic was temporary merged into the block mechanic in the January 19th, 2007 update. The change was reverted as stated here

Whenever a player's attack is evaded, he or she will briefly see a yellow indicator text: "evade".

Other ways of avoiding attacks include blocking skills as well as manually dodging (moving a character with the mouse or keyboard) projectiles.

Multiple sources of evasion stacked multiplicatively.

Related Skills
These skills cause evasion:
 * Defensive Stance (75% against melee and arrows)
 * Dodge (27...65% against arrows)
 * Zojun's Haste (27...65% against arrows)
 * Dryder's Defenses (75% against attacks)
 * Escape (Elite) (75% against attacks)
 * Lightning Reflexes (75% against attacks)
 * Shield of Deflection (Elite) (50...70% against attacks)
 * Distortion (75% against attacks)
 * Ward Against Melee (50% against melee)
 * Shroud of Distress (15...63% against attacks if below 50% health)
 * Displacement (100% against attacks)

These skills ignore evasion:
 * Irresistible Blow
 * Pure Strike
 * Jaizhenju Strike
 * Swift Chop
 * Wild Blow
 * Called Shot
 * Crippling Shot (Elite)
 * Precision Shot
 * Fox Fangs
 * Nine Tail Strike

These skills nullify evasion:
 * Warrior's Cunning
 * Seeking Arrows
 * Rigor Mortis
 * Illusionary Weaponry (Elite)
 * Expose Defenses
 * Unseen Fury
 * Way of the Fox
 * Guided Weapon
 * Guiding Hands

These skills are triggered by evasion:
 * Griffon's Sweep
 * Leviathan's Sweep
 * Seeking Blade
 * Furious Axe
 * Forceful Blow