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Extra Fast

From Diablo Wiki

Extra Fast is one of the possible bonuses Unique Monsters may obtain in Diablo II.

Extra Fast Unique Monsters have a very high speed. It is very difficult to escape from them, while monsters without that ability will lose you out of sight when you flee from them. The slowing effect of most magics and abilities will have very little effect on them, for it may slow them, but it does not slow the opponents by much and you will still probably be unable to outrun the enemies.

One particular annoyance occurs when an Extra Fast creature is of a type which can resurrect its minions; it then does so at a frightening rate. Either engage it in close combat or blind it to prevent this.

On Nightmare and Hell, minions will also gain this bonus.

Unique Monster Bonuses
Aura EnchantedCursedCold EnchantedExtra FastExtra StrongFire EnchantedLightning EnchantedMagic ResistantMana BurnMulti-shotSpectral HitStone SkinTeleportationThief