LIGHTNING FAST REACTIONS

The Aeldari can process battlefield events at baffling
speed, making their physical reactions so fast that they
are able to dodge attacks that would hit any other target.
Use this Stratagem in your opponent's Shooting
phase or the Fight phase, when an unit from your
army (excluding Monster units) is selected as the target of an attack. Until the end of the phase,
each time an attack is made against that unit,
subtract 1 from that attack’s hit roll.