Some warriors are fast beyond belief and can strike with supernatural speed. Whether this ability is innate or the result of enchantment matters little to the foe, who is often slain before he has a chance to acknowledge the attack.
Source: Warhammer Fantasy: 8th Edition
Always Strikes FirstURL Copied!
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Models with this special rule (or who are attacking with a weapon that grants this special rule) always strike first in close combat regardless of Initiative.
In addition, if the model's Initiative is equal to or higher than his enemy's, he can re-roll misses when striking in close combat – he moves so fast that he can land his blows with incredible precision. If the model with this rule is fighting an enemy with the same ability, the Attacks are made simultaneously, and neither model benefits from the re-rolls normally granted by this rule.