Teleportation

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Teleportation is making an object instantly disappear in one location and appear in another. It is fairly common in sci-fi and fantasy.

Warhammer 40,000

Teleportation is possible in Warhammer 40,000 but is not really a pleasant thing to do since it basically involves making a short jump through The Warp. It can be done either through technological means with a device known as a Teleportarium or Tellyporta, or through the use of psychic powers. Needless to say even going through the Warp for a Little While has it's risks. The danger is mitigated by the use of teleport homers and a highly skilled psyker.

Necrons have no need of The Warp or psykers to move instantly between locations. As their technology is just that more advanced compared to the other races and can tell the laws of physics to bugger off.

Star Trek

Teleportation is a common technology among all spacefaring powers by the 23rd century leaving aside some podunk regions of the Delta Quadrant. It's usually quite safe, though it can be quite finicky and can be stopped by a wide variety of things from jammers to electromagnetic storms. To explain why characters don't wind up a few inches shorter or vaporize into nothingness when they are transported. Technobabble in the form of the Heisenberg compensator was introduced during The Next Generation.

Dungeons and Dragons

Powerful enough spellcasters and magical beings can use one of the eponymous spells or assimilated. Some spells come with a chance of ending up in the wrong place, depending of the nature of the spell and how familiar the caster is with the place he wants to end up.