A Euclidean Mindphase is the effect of an obscure form of Necron technology that is often activated by Necron forces defending their Tomb Worlds. As attackers advance, it causes reality to shift around them; perspective and geometry twist out of phase until it is impossible to tell the difference between up and down. Few warriors can fight under such mind-bending circumstances, and the drastic slowing of their advance allows the Necrons to unleash more fusillades of firepower to wipe the enemy out.
- Planetstrike, pg. 45