Moving a mass through space instantaneously is many things. Subtle is not one of them.
The Relocator Block
Seen hanging from the ceiling to change the teleport domain of a smaller room below the main domain.
Spawns usually in veins of one. Good hunting!
Items added in the creative mod tab
Menu front page
An example of setting the domain of a Relocator. In this instance, the Relocator domain is a 7x7 cube with a height of 3 blocks and will land one block above ground level.
Here, a Relocator Relay can be seen extending the teleportation domain with its own domain. The relay must sit within the domain of either the Relocator or another relay to be included. See the overlapping 'domain' boxes in the image.
The Address Log can be used to store up to 12 positions. Slots can be overwritten any time. Coordinates will be pre-filled to the destination page when selecting a slot.