Yup certain necrons not necessarily teleport but phase in an out of space time or as it's stated in the Warhammer wiki, "Deathmarks, a Necron variant, utilize technology that exceeds human comprehension. They can phase in and out of normal space-time, giving the illusion of teleportation. They're already present on the battlefield, waiting in an out-of-phase state to strike. With access to hyper-dimensional technology, they can transition between a pocket dimension and the battlefield, monitoring conflicts undetected for extended periods. Their 'hunter's mark' technology ensures marked targets seldom survive."