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 they have a chance to acknowledge the attack.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Always Strikes FirstURL Copied!
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Models with this special rule always strike first in close combat, regardless of Initiative. If a model with this rule is fighting an enemy with the same ability, the model with the higher Initiative will strike first.
In addition, if the model's Initiative is higher than their enemy's when it is their turn to attack, they can re-roll failed To Hit rolls when striking in close combat – they move so fast that they can land their blows with incredible precision.